Stanley cup engraving issues - LightBurn Software Questions

I use a AtomStack A10 Pro at work and was given me the mission to engrave this cup, the thing is why it has different colors when engraving on the back and the front? I use a test where I engrave 3 circles, 20% power, 30% and 40% to know when the engraving will be black or metal color, all 3 was metal so I decided to go with the 40% BUT the engraving is black anyways. This one is 20%, it has the metal color Also I have a problem that the roller is going back and foward too fast it mess

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