what I see. Options

[awd4kicks]

With a stock FPR(~37psi line off), at 20lbs of boost a 190 can supply about 125lph. If you switch to the N/A regulator(~45psi line off), you're down to about 111lph.

So, the N/A regulator will fix your problem if the 190 can supply enough fuel at 17psi and your injectors are just too small, but its not a good idea if you think the pump isn't good enough.

I would have to agree with this from my experiences. The larger than stock fuel pump was installed to push more fuel through the injectors during their open time to make up for the injectors small size. This is the same reason to use the N/A FPR. Increased preasure means more fuel in the same time period....as long as the fuel pump is adequate.

This route also has the benefit of close-to-normal idle without fuel control. Where you normally need an AFC or MAFT of some sort to make the engine idle correctly with larger than stock injectors.