With 450cc injectors, you want an idle fuel pressure closer to 20 psi or even less. Problem is with that, fuel pressure begins to go too low for the car to run well.
I have the 235 cc back in also. I swapped them out just this last friday. I run80 psi of fuel. That way wen I boost to 10 it dosent run to lean but the idle is better. I raced a 02 grand prix gt and a 99 ford escort zx2 5 speed. they got spanked.