OK. What you are missing is Crit Hit damage.

Both weapons have no socket. Rule of thumb. Weapons MUST have socket because by forgoing socket - you potentially lose 110% CD each. In your case, you could have gotten extra 220% CD. CD is the mother of DPS, the Father being Crit Chance. Why, because CD amplifies your damage by % when you crit. Eg say you doing 50k hits, when you crit, the DPS is boosted by % of CD + 50k. So if you have 300%CD, the damage increased to 150k +50k =200k. So, by ignoring CD, you DPS is limited.

My advise will be ditching the Blackthorn set and swap it with a crafted chest or tal rasha chest and a Witching Hour Belt. TWH belt is almost considered BiS, but actually I prefer a highly rolled Inna Belt if you are using black damage weapons for bells.

Like yuhhur said, hook us up we have gears that we can give away. Details at pg 1