If the pcm flash made no change I would suspect badly worn accumulator pins/pistons/acc body bores but since the reflash did make a change then it is likely not the case. The pcm will learn a lot over time and the adaptive shifts can skew quite a bit off of stock. Doing a complete write on a pcm will reset this and put things back to a stock starting point. After you drive if a few days or weeks you will know if it goes back to where it was before the flash and if it really helped or just put it back to a starting point. It may also help with the stock tables and doing the last flash to keep shifts a bit softer and maybe the adaptive learn did not reset the first time. I use HPT and I know that doing a short write doesnt seem to effect this but doing a complete rewrite on a pcm will reset them.
