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Sucking in unmetered air would cause you to go lean for sure.
Check everything between the maf and the head.
All else fails do a compression test. Blowby will throw your afr's off also.
Also see if your cas walked from where you clocked it at. Timing also effects afr.
Only other thing i could tell you to check is your injectors. Take em out the rail, disconnect the coil packs, let the injectors (still in rail) rest in a drip pan and watch the spray pattern.
Best of luck. Good thing you have a wideband. Best purchase you can make for a turbo car.
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Just another broke ass drifter 
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