Not to direct you to a different forum, but check over at Ultimate Yota - there a lot of S/C 3.4 guys over there. I dont know if any of them are local in GA though, although all of them are very helpful guys!
Unless you have some sort of aftermarket controller, you cannot "tune" the TRD S/C setup. The ECM is capable of handling stock 5-7 psi automatically. If you upgrade to more boost/ diff pulley such as the 2.1 or 2.2 URD, then you would really NEED the URD 7th injector setup to handle the fuel supply that is needed with more than 7 psi. I'm getting 11 psi with the URD 7th setup working perfectly with minor street tuning I did myself with the provided software and my laptop. My setup is really maxed out but extremely reliable and efficient, yet making great power.
Ya I have the URD fuel mods and software and I'm aware of what is needed . when I dyno'd it a couple years ago it wasn't a great tune. The disk that URD sent was blank so that didn't help. And I went back to Afghanistan before I had a chance to get it looked at again. Thanks for providing nothing useful to this thread