Tt250 carb settings for 5000 - 9000 feet elevation

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Hello all, I have a 2020 tt250 and am struggling with finding the best carb setting for the elevation I ride at. I live at 6000 feet and ride anywhere between 4000 and 9000. I have tried moving the pin clip down one from stock to richen it and found more power at 6000 feet and under but then it was bogging down at low idle at 9000 feet elevation. It was also backfiring. So I moved it two up to lean it out. It is noticably down on power at 6000 ft. Joey from csc said the spark plug looked a little lean from picks I sent him when it was at the stock setting. Just curious if anyone out there has any suggestions. Thx!