You should read up some more on KA-T before you blow another motor. SAFC really won't help you much for a T3/T4 on stock tune. Look into ROM tunes such as RS Enthalpy. Don't be cheap on the tune, it costs nearly the same as a SAFC and is specific to you're setup. The SAFC just adjusts the signal from the MAF and has no timing adjustment.
I created this thread for a similar setup here:
#/f/showthread.php?t=572741
I would read through that and send Martin at RS Enthalpy an email.