10w laser metal tins

Morning! I’m having a heck of a time with the 10w laser and black painted, metal altoids type tins. Everytime I try to engrave them, they bend I’m assuming from the heat. I’ve tried dropping the power, but then I don’t get a good engraving. Anyone have any proven settings?

Do multiple passes with the lower power, or multiple passes with a higher speed and power.

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