8 3/4 guru need your help

Okay I'll bite what the He&@s an ALS case where from is it the Mopar billet or something else

This is the 742 AL case



This is the 742 AL case now beyond 500 passes, mid 9's full weight b body leave off t-brake at 5800

The stl case has a cap deflection issue from what i see when they fail, even using the MW billet cap and seen the same situation.
What i am going to try are slightly larger diameter studs and pining it so the cap can't move, then i believe the 742 stl case should be as good as the AL case.