There is specific torque for nut... But it's not necessary to follow very closely. As long as they are tighten reasonably... There is no issue with vibration n other wear n tear issue.
Nothing to be worried. If your 80lbft is right, I think my nut is tighten around there.
If u didn't experience any extra vibration before n after using this setup, good for u.
I have never experience any vibration issue with hand tighten nut on wheels.
My main point is, introducing only 1 lock nut to each wheel, and 3 other ori nuts is not recommended as this heavier lock nut induce imbalance rotational force.
I'm just sharing my knowledge n experience. Even before installing these lock nuts, I had this concern, and the result didn't surprise me.
Blurjoey using splinedrive n it's lock nut, which I think their weight is the same or very very close. Therefore no vibration issue. Probably, can sifu blurjoey help measure the weight when doing tyre rotation then.
Well if you have bad experience with single lock nut, that causes your wheel inbalance or whatever you are facing, that's too bad. Must be the uneven torque pressure you did for your wheel. Just get a torque wrench.
By hand you can know that u have tighten it around the recommended torque pressure. Champion.