Though there is a good deal of claim that a good tune increases 'driveability', there is no indication by any one that has done them that there is actually any increase in performance from numbers returned on a dyno or from the track.
As per the transmission, it is not POS, rather it is just not designed to deal with treating the car as if it were a drag racer. You do that a lot and yes, you get transmission problems. Those that do not do so tend to get long term good results from the transmission, though like any device with moving parts, it benefits from proper preventive maintenance as well as eventually being subject to wear and needing rebuild. Its pretty common for well maintained and reasonably treated transmissions in this car to still be going just fine at 150k miles and more. By example, mine is now over 200k and has never had a burp. But it has also had regular fluid and filter replacements and its number of drag strip type runs can be counted on 2 hands.
pax, smn