are you sure your feulpressure vacuumline is connected to the a source without a checkvalve? or if it's t-ed with the 3 bar map sensor, that one is still good?
I have just a single 255 Pump in my T-type and per Date master the Car is making 594 HP
Now I dont know if thats estimating at the wheels or at the crank but the car has been 10.60's without any issues. I have yet to see a lean or fuel pressure issue with it either. Im up grading just to be safe but I can honestly say I dont think Im the only one out there with this set up and making that kind of power in GN Or Turbo T so why would a Sy or Ty be diff. ??