Issues on anodized aluminum on rotary

I am having an issue getting my objects to fill properly. You can see if I run at a speed of 100 or more i get the result in the bad pi, if I run at 20, I get the good one. But I can’t run my projects at 20, I will never finish. I have a k40 with a GRBL board, using the latest lightburn version. I am not sure what else I can try, My lines per inch is up to 500, I made sure all my belts were snug, the machine is stable. any ideas?

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