Hmmm? Seems like it should be sufficent, something must be off somewhere. Sorry, aside from injectors, I'm not good with ideas. What line are you using to connect the fuel filter to the fuel rail? My friend had a B18C1 swap that wouldn't run right, always seemed like the ECU was pulling timing out. Turns out, something was wrong with that hose (or the banjo fitting) and it was cutting his fuel pressure. Got it fixed and it ran like a champ. Seeya.