Thank you for those quotes, and happy new year.
Were those church fathers writing within the context of people pitting scripture against tradition - as is the purpose of the conception of Sola Scriptura; to debunk Roman Catholic tradition? Or was it in the context that scripture and tradition were not at odds with each other, and that scripture is the tradition written down? Were they participating within the liturgical life of the church, that also shaped their thinking and interpretation of scripture?
Irenaeus -
But, again, when we refer them to that tradition which originates from the apostles, [and] which is preserved by means of the succession of presbyters in the Churches, they [Gnostics] object to tradition, saying that they themselves are wiser not merely than the presbyters, but even than the apostles, because they have discovered the unadulterated truth. (Against Heresies 3.2.2; ANF p. 416
It is within the power of all, therefore, in every Church, who may wish to see the truth, to contemplate clearly the tradition of the apostles manifested throughout the whole world; and we are in a position to reckon up those who were by the apostles instituted bishops in the Churches, and [to demonstrate] the succession of these men to our own times . . . . (Against Heresies 3.3.1; ANF p. 416
St. Gregory of Nyssa which you quoted(c.A.D. 335-394),brother of St. Basil the Great, Doctor of the Catholic Church and bishop of Nyssa writes:
"[F]or it is enough for proof of our statement, that the TRADITION has come down to us from our fathers, handed on, like some inheritance, by succession from the apostles and the saints who came after them. They, on the other hand, who change their doctrines to this novelty, would need the support of arguments in abundance, if they were about to bring over to their views, not men light as dust, and unstable, but men of weight and steadiness: but so long as their statement is advanced without being established, and without being proved, who is so foolish and so brutish as to account the teaching of the evangelists and apostles, and of those who have successively shone like lights in the churches, of less force than this undemonstrated nonsense?" (Against Eunomius,4:6).
St. Basil the Great(A.D. 329-379), Doctor of the Catholic Church, bishop of Caesarea, and brother St. Gregory of Nyssa’s writes:
"Of the dogmas and kergymas preserved in the Church, some we possess from written teaching and others we receive from the tradition of the Apostles, handed on to us in mystery. In respect to piety both are of the same force. No one will contradict any of these, no one, at any rate, who is even moderately versed in manners ecclesiastical. Indeed, were we to try to reject the unwritten customs as having no great authority, we would unwittingly injure the Gospel in its vitals; or rather, we would reduce kergyma to a mere term" (Holy Spirt 27:66).
Tertullian, which you quoted:
"Now, what that was which they [the Apostles] preached—in other words, what it was which Christ revealed to them—can, as I must here likewise prescribe, properly be proved in no other way than by those very Churches which the Apostles founded in person, by declaring the Gospel to them directly themselves, both vivâ voce, as the phrase is, and subsequently by their epistles. If, then, these things are so, it is in the same degree manifest that all doctrine which agrees with the Apostolic Churches—those moulds and original sources of the Faith must be reckoned for truth, as undoubtedly containing that which the (said) Churches received from the Apostles, the Apostles from Christ, Christ from God. Whereas all doctrine must be prejudged as false which savours of contrariety to the Truth of the Churches and Apostles of Christ and God. It remains, then, that we demonstrate whether this doctrine of ours, of which we have now given the rule, has its origin in the Tradition of the Apostles, and whether all other doctrines do not ipso facto proceed from falsehood. We hold communion with the Apostolic Churches because our doctrine is in no respect different from theirs. This is our witness of truth." - Tertullian, The Prescription Against Heretics
(Does your church have apostolic succession? I'd be surprised if any Protestant church still holds to it outside of certain conservative Anglicans and Lutherans)
Tertullian again:
"But even if a discussion [with the heretics] from the Scriptures should not turn out in such a way as to place both sides on a par, (yet) the natural order of things would require that this point should be first proposed, which is now the only one which we must discuss: “With whom lies that very Faith to which the Scriptures belong. From what and through whom, and when, and to whom, has been handed down that rule, by which men become Christians?” For wherever it shall be manifest that the true Christian rule and Faith shall be, there will likewise be the true Scriptures and expositions thereof, and all the Christian Traditions." - Tertullian, The Prescription Against the Heretics, 19
ALL the Christian Traditions. Not the cherrypicked ones that some people claim are in line with their own private reading.
So for Tertullian, in order to be a legitimate interpreter of scripture, one must be within a church with apostolic succession, and hold to all the Church's traditions. And finally, the checkmate from Tertullian:
"Since this is the case, in order that the truth may be adjudged to belong to us [the Church], 'as many as walk according to the rule,' which the Church has handed down from the Apostles, the Apostles from Christ, and Christ from God, the reason of our position is clear, when it determines that heretics ought not to be allowed to challenge an appeal to the Scriptures, since we, without the Scriptures, prove that they have nothing to do with the Scriptures. For as they are heretics, they cannot be true Christians, because it is not from Christ that they get that which they pursue of their own mere choice, and from the pursuit incur and admit the name of heretics. Thus, not being Christians, they have acquired no right to the Christian Scriptures; and it may be very fairly said to them, 'Who are you? When and whence did you come? As you are none of mine, what have you to do with that which is mine?'"
It is clear then that the context in which the church fathers talk about scripture is safely within the bounds of Holy Tradition, and not in the attitude of pitting scripture against tradition, as Sola Scriptura is used for. Even what is defined as scripture is determined by tradition, unless you can find me a contents page in scripture. It is like Doctors within KKM talking about some treatment modality, while random people online who do not undergo the same training as those KKM doctors at all, give their opinions on the same treatment modalities. They may practice TCM, or Ayurveda, or believe that they are doctors, but unless they are registered Drs with Malaysian Medical Council - searchable on MERITS, they are not licenced to practice medicine in Malaysia.
If scripture alone is so clear, why the need for any ecumenical councils? Surely everyone would read the same thing the exact same way, everyone would sing kumbayah and think the same way? If scripture alone is meant to return the church to its primordial state of unity, why all the thousands upon thousands of schisms? Arminian vs Calvinist vs Molinism and everything in between? I myself used to belong to the Methodist church which is a schism from the Anglican church, which is a schism from the Roman Catholic church, which is a schism from the Pentarchy. The Methodist church gave birth to even more schisms, the Salvation Army etc and many many more from the Holiness movement. Even Joseph Smith was involved with the Methodist church at one time. And this is just one mainline denomination. Scripture Alone is the great divider, the idea that brings forth disunity and breaks the body of Christ into a million pieces. You may say you are united in certain fundamental doctrines, but then, what makes your interpretation more valid than Joseph Smith? Or Arius? It is just the church of the least common denominator. Then what makes you different from Islam, Judaism or Sikhism? They too believe in one God. How low does the bar go and according to whom? This is why only those churches who are the spawn of the Solas hold to liberal theology, women presbyters, same-sex unions, same-sex married clergy. The "United" Methodist Church in the US kicking out those who believe that marriage is between a man and a woman. Even the Roman Catholics will not sink that far.

I think it is important to define further what is the ‘tradition’ if you hold that God’s truth is communicated through scripture and tradition.
We are not saying that God cannot communicate truth through a church father’s sermon, or books, songs, letters, or liturgical practise, etc. He can, and does. Protestants believe that too.
But traditions need to be seen as declarative, not creative. The church cannot create a tradition on its own, but declare what is already in scriptures.
And when a tradition goes against scriptures, it becomes the enemy of orthodox biblical doctrine, and church fathers have gotten things wrong big time, all the time. Ecumenical councils can get things wrong too. In my own study of church history and creeds, I saw how a single ill-defined statement of the church morphed into complex doctrines after a few centuries ( think of the doctrines of Mary).
Ultimately, the issue here is to regard the church as infallible.
I think the early church fathers would be horrified to see what the Roman church has become today.
I hold that scripture is clear and perspicuous. The problem is not with scriptures, but with men. If only we allow scriptures to say what it means, and mean what it says, we’ll all be singing kumbayah together
Church traditions are debated all the time in the Catholic Church too. It’s not like everybody agrees what is correct and not.