Here’s a sample I did of your photo using a screen grab to get the eagle image. This is with a OLM3 (10 watt Diode) with settings of 6,000mm/min at 70% power and 1 pass. The “fill” option took about 3.5 minutes. This is on a 3mm wood coaster disc ordered from Amazon.
I never thought, but do you need the LB file I used? I hope I did it right for attaching a file. Check the “show notes” where I made a couple of comments.