Here a quick fix to your problem make the stock FPR adjustable.
Note: You can only raise fuel pressure this way not lower it, I know your trying to raise fuel pressure though.
Not true on the injector part.morepower2 said:Sorry I forgot to answer your post. The way to tell for sure if you are maxing out your maf is to measure the voltage of the singnal wire to the ecu when you are WOT in third gear past the torque peak. If you are pulling more than 5.1 volts, then you are maxing out the injectors.