i can help you with your boost control. I have the hondata boost per gear with a 7 psi spring. I'm running 7psi in 1st and 2nd and 3-6 10 psi on a street tune with a/f 11.5 and no knock. I need to get on the dyno to tune for power. I have 750 injectors and 255 fuel pump and my inject. duty is 60% at 10 psi. You are running a returnless system thats why you require bigger injectors but 100% at 9 psi might be something wrong. Fuel pressure?