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Have you tried gapping down the plugs? I want to say a few companies recommend it when running over E30. That could certainly lead to the breakup issues though I don't think it would cause rail pressure drops.
Have you tried flashing to a stock or 93 tune to log and see if the issue persists? Maybe it's the file itself that is causing the issues.
I've never heard of or used Wedge Performance but I know first hand what it's like chasing fuel cuts and break ups endlessly with ethanol mixes on my previous Audi. Especially in colder temps which require the fuel system to work even harder.
One thing that worked for me was starting fresh from square one. Log the car with only pump gas and see if it's a mechanical issue or if everything is fine. Then work your way back up. It's not fun but trust me I know exactly what you are going through and the frustration. At the end of the day maybe it's worth considering a different tuner if it doesn't get resolved
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