Lines in finished burn

Using a 7w Jtech on Shapeoko at 130 ipm on a 10x10 image. I am pretty happy with the grayscale but would like to eliminate the white scratch looking lines. I have my line interval set to .0075 (.2mm) per Jtech instructions but was wondering if the spacing is the issue?

0.2mm is pretty high for a diode. You could probably go as low as 0.07mm (~0.003in). Make sure the rails are clean and smooth too.

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