Smooth Acrylic Engrave Settings, please help!

Hello! I’m new here, have had my Pro for about a month!

I work with acrylic (proofgrade and Canal Plastics) and I have been trying to get some smooth engraving that is not too deep.

I have tried raising the lines per inch (450), which helps the smoothness some. I have also been defocusing the laser from .125 to .225. When I try lowering the power to say 80 or 60 to get a more shallow engrave it ends up bumpy, compared to the smoothness I get when I use full power.

Here are some examples:

Are there any other adjustments I can do to make it a shallow smooth engrave?

Thanks for your time!
Katie

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