TroGlass reverse advice

Hi all,
I hope that someone has tried using TroGlass reverse from trotec. I need to make some back engraved and color filled signs (house numbers). I have tried multiple settings and got it relatively clear but not good enough. And then there is the pain from trotec… it does not look professional to have a blob of paint on the back. Spay paint worked better.

I have a 100watt co2 laser. My settings for now are: speed 350, power 25, lines per inch 604.76, z offset -7mm.

Does anyone have some settings or experience to share? I really tried for days now… :pensive: