It'd been pretty consistant up until maybe a couple weeks ago, then it started showing 11.6ish AFRs at idle and even richer during cruise/light accel/WOT. I tried some parking lot tuning of the VE table to try and lean the idle out (edit- target was around 13.3:1 per Jerry's recommendation, took entering '15' in the VE table's cells to accomplish), but cycling the car off and back on resulted in a very rough idle and the gauge reading 17:1 to full lean [---]. So at best, it seems like the gauge is intermittently reading very rich, and then from time to time reads as it should.

Am I losing my mind or is this thing taking a crap on me?

 

log it. It could easily have been your AIT corrections with higher intake temps. I dont like the scale that DIY uses on their maps.