The oxygen pockets inside the matierial will cause it to burn. they are right to switch to nitrogen and run it as fast as possible with the trace off. i would find a condition for thin SS and use it as a starting point. more than likely you will need to loved the power and the duty. im inclined...
If you have the option, you can use the B cut setting as well. if you combine it with M134 it will vaporize the plastic on the toop, then come down and make a very small hole after the pierce to use as a lead in point. i've had luck with this before when cutting thick SS or AL that has the film...
