You don't say anything about how you are controlling torch height....fir cutting gauge material torch to work distance is extremely critical to control cut quality and dross. Assuming you can ensure that the torch to work distance is being maintained accurately, the next step is to use the machine cutting parameters listed in the Powermax600 operators manual. Use the part numbers suggested for machine cutting regardless of whether you are using a hand or machine torch, and follow the optimum speed listings, amperage settings, torch height and pierce height for all materials. If you do not have the manual, it can be downloaded (free) from Hypertherm | Plasma Cutters | Plasma Cutting Equipment | Metal Cutting Equipment , click on document downloads at the top of the home page, choose your system. Also on the Hypertherm page are cmplete listings for part numbers and consumable sets for every Hypertherm system ever produced....go to Products, consumables, then choose your system. Here is a link to the consumables available for your Powermax600: https://www.hypertherm.com/library/f...wermax600H.pdf
For best cuts with a 600 on 16 gauge, use the FineCut parts, and follow the cut specs in the manual. The cuts will be virtually dross free (with correct speed and height.
Jim Colt Hypertherm