That would be my first test too. Either drop the slide a little or close the air screw a tad. If it still hangs and is strictly after doing WOT runs, I'd be thinking about the main. When you back the throttle off just a bit (from WOT) does it surge or run on, are you getting any pinging? What sized main are you running with which needle? Have you done a plug chop at WOT?
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