when i was auto i was running 15psi on an evo 9 set up..power wise was around 250 ish with torque in the 260+ and i was running no cooler...i was like that for about three years before i swapped to five speed, and now going to fully built evo motor :P.
it all depends on how you drive...i drove it like a daily driver which is what it was so transmission didnt really see any abuse unless i did a WOT run which sometimes not always would not shift as quickly due to the RPMs moving so fast and the computer not being used to seeing the RPMS move so fast to send a signal to shift gears.(anyone correct me if im wrong, but the A/T shifts gears when the computer sends the a signal for it to change...so with the increase in power and RPMS redlining faster than what the computer was programmed to do its only natural for it LAG in between shifts??? i know its something of that nature..so if that being true, tapping into that signal to be more alert would that make the transmission shift more smoothly????...i just throwing ideas out there...)
my suggestion if your gonna rag on the car, then start looking for replacement transmissions other than that you will be fine...others might think different, but this is from my experience being boosted with A/T for 3 years.