6psi on stock injectors will put you in a very nice 14+:1 a/f.
You definatly don't need to run any more.
Get 440's or DSM 450's if you feel so inclined. However the voltage on them, as told to me by a few people, is not always constant, and they have a tendency to not flow as perfectly as a good set of RC's.

They worked great for me, Just thought I'd let you know.