I know this is an old thread but I’m just getting into this 3d engraving with a laser my first couple came out like yours. But then I tried max power 50% then on min power I did 0% wasn’t sure it would fire that way but in the gay scale setting it did and came out with a great looking piece without any burn on the parts that were meant to be untouched and those were left untouched.
Just wondering if you have tried this and if I’m on the right track or not any help would be appreciated thank you Tom