I have always had the same issues. My idle has to be very rich to sound decent (12:1-13:1) which of course pegs my regular o2's at .9. If I change to tuning to bring it up to a normal air/fuel is starts misfiring and generally running poor. Normal fuel pressure, etc. I run a single intake however.
Mine also runs better with the a/c on. My injectors aren't leaking as I just installed new orings and pressure tested just in case.