Help with laser engraving

Hello,
I am seeking help for laser engraving on plastic cards.
The engraving is incomplete, and there are thin lines when switching from one engraving to another.
I am using vector engraving with 55% power, a speed of 300 mm/min, a refresh rate of 1000 mm/min, one pass, and constant power mode is disabled.

If anyone can help me figure out how to fix this issue, I would appreciate it.

Maybe this:

Which laser module? Read this thread: Laser Frustrations and bugs for some observations - the 10W seems to have a bug in the firmeare IMHO for constant power off, and the 2W may need tweaking at the low power end (M2000 L24 Pxx).

If it is the10W, please file a support ticket! I never received a final answer to my request on that, and a bump might be good!