I use the default CC depth of cut and speeds for the drag bits on cast acrylic.
I use the Top of stock for zero.
I found the real adjustment is in how many turns did you compress the spring.
I use 3/4 to 1 1/2 turns.
Cast acrylic has varying thickness, so light features may fade (not cut as much) when in a valley.
Make sure the tip compresses evenly, just push the tip to check for a “catch” in the motion.
A little light oil if it is hanging. It is sharp, so beware.
Running a path for a second time will change the look to a point.
If you etch the backside, make sure you mirror the geometry/path .
I have very limited experience with adding LED’s, ( how many, spacing, lumens ).
Trial and error is king.
Here is a good link from the past. I have to try a mirror …
Look up Mc Etcher in the search field