I'm guessing that you either have a Hypertherm Powermax65 or Powermax85 system. Also....you have listed the cut height below as .02"...it should be .06". Another point....and I have seen this issue with Dynatorch height controls before...use the Hypertherm recommended voltage setting just as a starting point...and adjust the arc voltage so that the torch standoff stays at .06" durring the cut. Do not worry if the arc voltage readout is wayy off the 130 volts in order to maintain .06"...the physical height is most important.
Most cutting machines have a hard time maintaining speeds above about 150 inches per minute, especially when there is a lot of detail in the cuts. This causes the machine to be in accel and decell modes most of the time, so effectively is doing the cutting at speeds considerably slower than you want to be cutting at. Plasma produces dross (called low speed dross) when it is cutting too slow.
If you have a 65 or 85 plasma...bst bet is to use the FineCut consumables, follow the specs and adjust height as suggested above. The FineCuts allow you to use slower speeds. You also can simply use lower amperage with the 45 amp nozzle....I have been successful with that nozzle at 30 to 35 amps on 16 gauge....I woul experiment with speed, maybe start at around 120 and keep increasing until dross goes away...once again, maintain the physical cut height. Everytime you change speed you may have to tweak the arc voltage to keep it at .06" off the plate.
Hope this helps...let me know your results!
Jim Colt Hypertherm