Here are a couple quick tries. First I did 70power and 270lpi. I thought it engraved pretty deep so I backed off the power to 50 (but up the LPI to 340lpi thinking maybe darker but it turned out not quite so deep but also lighter. No mask I just wanted to get something quick for you. If you want me to try something else I would be happy to. Of course take my tests for what they are worth. Your mileage may vary. 
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