Hi, I'm having trouble welding 0.065" wall SS304 square tubing. I'm using a Lincoln EZ MIG 140 with 308L wire and 2.5CO2/7.5Ar/90He gas without much luck. I've been all over the ABCD voltage settings and up and down wire feeds using 0.023 and 0.030 wire. Welds beads are all pretty much just sit...