I'm having problems cutting with my torch. I'm cutting 16 guage sheet metal. As I'm cutting, the material is melting back onto the cut as I move along the cutting line. I've tried lowering the gas and or oxygen and keep getting the same results. When I cut thicker metal I don't see this problem is 16 guage material just too thin for a torch? Should I just use a cutting wheel on a grinder? Any help is appreciated.