I found the same issue with amperage. I thought I was doing something wrong since all published stuff I saw said 1 amp per thou. So, on .50 sheet metal I set the machine at 65 amps and went to town. I had my Dad watch the readout on the welder as I was welding. Turns out that I used about 62 amps to create the puddle and as I moved along, I was down around 48-52. I guess once some heat soaks into the material it acts as a pre-heat and then allows you to back off on the current. Just a guess.
Now I need to make a torch stand, quit posting that stuff. I have enough to do!
