13.6 to 13.8 AFR is in range. Did you do a data collection and send it along with a description of your problem to T-Max support. To me it sounds more like a timing issue not a AFR issue and T-Max has a proceedure to set your "timing vs engine temp" .
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.