One thing many people don't think about when jetting a bike is how airflow is effected at speed . There are some bikes that'll run great to redline in lower gears but at higher speeds they act lean or rich .Any mods done to the airbox can greatly effect this . I see it when running one of my wideband a/f meters . Completely stock setups aren't usually too bad other than a few when certain headwinds or crosswinds .
I'd try going up one size on the main and if it helps , go up another all the while seeing how it's running at slower speeds but higher revs . There is also possible that the slide spring is getting weak and the slide starts sputtering badly at speed as well. If a person puts a camera in the intake tract for veiwing as your riding and most people would be shocked at how badly those cv slide can flutter , no wonder they run horrible .
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'86 XT600/3TB motor,,, '88 XT600, ,,'92 XT600e,,, '08 Husky TE510,,, '05 DRZ463,,, '95 KLX650 ,,,'96 KLX650
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