b16ahybrid

What should my idle fuel pressure be set at ?
It's a b16a2 with 310cc injectors.
Reason why i ask is because i had a 8:1 diaphram in my fmu but under boost i was runing way to rich (the car would bogg above 5k rpm's) so i droped down to a 6:1 and everything is fine now.My fuel pressure sits at about 37psi at idle so i was thinking of playing around with the idle fuel pressure (raising it) to try and richen up the fuel mixture a little but without going to far and run rich at idle.What do you guys run for idle fuel pressure?Is the aem fpr a 1:1 when under boost? So i may be acually runing more like 7:1 when under boost (aem 1:1 + fmu 6:1).I also pulled my plugs to change them and they were kinda gray looking (lean???) but they had no deposits on them (no specs)Then again i have only put about 300-500 miles on the plugs.Thanks.