Rob doesn't have the same converter, he has a 1057.
You have a similar trans as E. Carter, but neither yours or Robs is even like his. 30psi of mainline along with no or minimal cut back will mask a weakness in a trans. The guy who started this thread has a 5sp, which in stock configuration, has proven to be weaker than the 6sp.
Tuning will play a major role in a trans living as far as shift quality, but HP will smoke a weak clutch... taking the shifting out of the picture. This guys problem was the C1, which shifting has nothing to do with, as it comes on and stays on....til it goes off of course.