I just started trying to tack a floor pan i'm doing. I have a Lincoln 180 Mig with the voltage all the way down and Im burning through the metal really bad. Not as much on the new metal but on the car where it is thinner . I'm using .o35 wire and 75/25 mix. Should I switch to .025? Or flux core wire with no gas? As soon as I touch the trigger I instantly burn through. Anybody have any advice?