Lean idle when warm, checked basics

[di-devol]

Well, the car runs fantastic, good afr's after first start. Good afr's in boost, good afr's cruise.

This seems to be an intermittent problem.

So here we go:
On a cold start car runs rich(normal) 20 vac. Once warm occasionally, vac goes to 12-15 and runs so lean that the wideband maxes out full lean. Car "lopes" like a V-8.
Car occasionally run lean on VERY light throttle/Tip-in as well.
The thing that is getting me is would the car even run this lean? Idle is stable at 850rpms. Doesn't die, even running a un-reticulated BOV(runs rich when opened of course).

No vac leaks
No boost leaks(checked @30psi)
No exhaust leaks
02 sensor good
Maf is good
Injectors are brand new(and good)
CTS good
TPS good
Timing @15
Fuel pressure stock with nismo fpr


JWT tune
Sard 850's
GT2871r
Z32 maf
9:1 cp
Tomei 256 PonCams

Help if you can, the only thing that COULD be it I think is my MAF placement.
Could be a little too close: