I have the same problem. Noticed looking from the front of the carbs. The right mixture screw is higher when I seated both the screws.
Warmed up the bike, turning them to 2 1/2 rotations.
Which makes.
Left Mixture screw richer (More Fuel) than the right side.
To tweak things, I used a infrared gun to measure header temperatures, blip the idle, watch the idle to see if it dips below idle, and adjusted with offset screw driver.
Don't know if it's the best way or why the mixture screws are not the same.
Note* I have a dynojet kit jets and needles installed.
Hope it helps.
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