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So to put this in perspective, 50ft# tork should net approx 9500 # clamping force and 80ft# 12500 #clamping force.
If the clearances do not remain constant that would indicate movement /distortion causing the binding.
It could be the caps or the shims are compressing, you just have to test each one.
Typically, 1/2-20 (GR 8) bolts max tork at 80-90ft# lubed before yielding.
John