I'm curious, what did you try setting the WOT fuel to when it acted funky?
Also are you going through each menu and changing each setting or are you just changing tunes and using the "Load Previous Settings"?
I would leave the timing alone while towing anything, even if you are using a higher grade fuel. This almost sounds like what my truck did when I took the intake snorkel out of the fender and had a breeze blow over it.
See if it still does that when you use all of the adjusted settings besides timing advancement.
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