Mechanic hooked up a pressure gauge to see what's going on with the fuel. What it looks like is the fuel pump should be providing the required capacity & pressure. Pinch off the return and the pressure shoots up to 100 psi.
The fuel pressure regulator on the other hand... It seems like the stock non-boost-sensing regulator is keeping pressures to the 40 psi range even under boost.
An adjustable fuel pressure regulator with vacuum/boost compensating port may be the first thing to try.
Anyone have any favorites?
I've heard these are pretty good:
http://www.fluidcontrol.net/pages/regulators.html 
