I get it, OEM tune usually has plenty of margin built into it. But this isn't 1990...
I prefer a different approach to performance tuning, I would much rather use something a bit more controlable. Instead of perminent hack, you can try one of many piggy back systems, that can fool sensors based on RPMs and or engine load.
I am going to experiment with AEM FIC piggyback system and report how it working out. I already bought the system, I just have to find time to install it and start playing with it.
96 Eclipse Spyder GSX (already turbo, AWD swap)
93 Eagle Summit AWD (4G63 turbo swaps)