We are currently working on cutting some shims from 11 gauge and 16 gauge sheet metal on our plasma burner. We have tried as many as 5 sheets 60x246 at once to cut faster. We are getting to much slag with the shims on the top and bottom sheets. We have reduced it to 2 sheets but the slag is still a problem. Any ideas on how to reduce the slag and how many sheets we can use to maximze our labor?