Did you have any luck with what I suggested this morning? Sorry if I wasn't very helpful. I was in a bit of a difficult spot.
0.375 Is at the limits of that machine. Every thing needs to be in great shape if your going to have success. Good optics, clean 7.5" lens, clean and round 2.0mm nozzle, good beam alignment.....
First step, is to get comfortable with some 0.25" or 0.1875". Move the focus up and down by 0.040" increments till you get a good cut. Ideally, you would establish a range with poor cut on either end of the range of focal points and then set your 0.375" focal point in the middle of that range.
Then I would go.
30ipm 2000 Watts 800Hz 80% 0.05Mpa 0.060" gap.
I have attached a document that gives some other ideas. Take a look.
