I notice that you have a 76mm C&L MAF meter. What MAF meter did you transfer your electronics from? Was it a working stock meter?
My guess is that your MAF meter isn't working properly so the engine runs fine in closed-loop mode since the O2 sensors are used for making fuel adjustments. When you go to WOT, which your computer is clearly picking up, it uses readings from the MAF sensor to determine how much air is coming in to calculate fuel delivery. Since it's not correct, it runs crappy.
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