I have been trying to cut some 1/2" holes in 1/2"SS. I am finding that the blow back form piercing to be quite a problem. I have tried changing the height, using anti splatter with little improvement. Changing the cut height to 0.08" helped from crashing into the top slag, but I have burnt through a couple of shields in the process. I have similar issues with Aluminum since it doest oxidize either. Is unshielded consumables the best for non-ferrous? Any other Tips?

Thanks
Will