it is normal from what i gather to have the FP dip when you rev the motor. it depends upon how much vacuum was removed while revving (real fast rev vs a slower rev where vac is maintained).
PCV is bi-directional. if one is worried about it, runnin a catch can and filter is the best route, as far as i know.
as said, codes are stored in KAM. you can check the values of the lambdas warm and cold (closed loop occurs around 170-178*, IIRC).
but since both banks are lean, i would really check the primary systems first. as said, FP could be it (Dark 5.0, i was not refuting you or trying to be a jerk - just stating what i thought i knew. it sounds like you are pretty sure about what you said, and i have no reason to doubt it!).
also your MAF being outta whack or dirty can cause bad input.
one last thing i can think of- you might want to check your ECT and ACT. one or the other may be telling the puter that the car is warm and ready for closed loop, when in fact the car is cold, thus causing a lean condition. but when running codes, the sensor checks out ok, as it is within parameters, albeit not the correct ones for the situation.
just my two cents worth.
good luck.
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