I wouldnt worry much about washing out your cylinders if youre only running so rich under boost. IF you are running like that during cruise and idle and light throttle, sure... but if its just during WOT, I am not sure I would worry much about 10.4:1.
you could probably pull out a few tenths of a point, but i wouldnt wander too far from your prescribed tune from GTM unless you are very confident in your tuner
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