Would you say that clutch pack clearances on set up may also have an effect on how it shifts? How about parts used like reds vs stock fibers or a 24 Spring return module or kevlar bands etc? The reason I ask is on the one I just rebuilt I used a 24 spring module, reds and I used 5 clutches in the front drum. I set the clearances on the front drum at ,071 and the rear came in at .035 and Kevlar bands. Stall is 38-4200 with a transact RMVB & low band apply. The 2-3 shift is incredible with this set up, 3rd too hit hard enough that yesterday on full acceleration it got a a pretty long roast, I was in shock. Of course this is on the street where traction is limited.
