Fiber Laser Engraving on RED tumblers

Im having issues with red tumblers and bottles. I thought i had figured this all out and when i use red, everything looks horrible. I tried all the settings i used for orange, blue and purple along with so many other variables and nothing makes it better. Ive slowed my speed. Reduced and increased my power and frequency along with complete focus to defocused by 5.5 mm, and nothing. Ive attached a few pics for reference.

If your setings is correct, the problem should be the coated

Here are some samples of different settings but nothing seems to burn clean.