definitely don't go romping on it with that AF... try cleaning off your MAF element... that might help. I'm betting your K&N was a little over oiled and gooped the element. Normally they don't run that lean.
FWIW... I would have aborted the run at 3500rpm with an AF like that. In fact I'd be upset if a TUNER ran my car to redline at 14.4:1... really upset.
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