Most of the stuff I weld is SS at about 90-100A or so. Last weekend I was welding some nuts and the amperage was set at 75A. I noticed when I was using the foot pedal that the arc would start a little later than usual as I depressed the pedal. Is this because the amps were lower than usual or is the pot wearing? The arc would start just a fraction of a second later than usual but I could still tell the difference. Anyone else notice this?