Ross,
I spent a lot of time trying to tune the setup you currently have and was never pleased with it. I had the same issues you have.
The set up starting point I was referring to and recommend is #7 slide, 42pilot, CCK#3, 178 for sea level, 60F. (A #8 slide works a bit better on some engines.) With fine tuning, this set up will address the issues you are having. Further, you will get better part throttle controllability and better fuel mileage.
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Eric K
'06 GasGas EC300
'01 GasGas XC300
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