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If you flash your stock tune, then flash the custom tune, does it still do it? I ask because when you flash tunes, it resets you LTFT and I've noticed that temporarily fixes my issue. Reseting adaptations does not reset my LTFT(at least not in bootmod3).
But like you my tune ran well for a few days (when my LTFT is 1.00) then a few days later it is 1.15 or above, runs really rich and stumbles at high throttle. My logs also show a HPFP dip below target when this occurs. Stock flash has no problem. I think MHD logs it as a percentage though. So your LTFT would be something like +20% instead of 1.20
I'm starting to suspect it's heat related. When EGTs get really high, the DME will richen up the mixture to try and keep things cool. There are no EGT sensors on our motors so its actually a calculated value but mine gets to around 1950F pre turbo and 1450F post turbo. I wonder if your logs show anything similar
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