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You probably know, but carbs have different circuits internally, for different amounts of throttle opening. Not different RPMs, but different amounts of twist of the grip. Your problem seems to be at wide open throttle. At this setting, the mixture is controlled by the main jets, so I'd look for dirt in them. Partially clogged main jets will cause a problem like yours.
I wondered if you were running on one cylinder, so I wanted you to check the head pipes when you started the engine, to see if they warm up equally quickly. If they do, you can still use an IR thermometer to check their temperature after you experience the problem, and if it's happening on only one cylinder, it will tell you which on is doing it.
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