EXT250 A/C questions

[todmorg]

Finally got around to trying light aluminum, and I have a few questions

1- My cleaning #'s go from -40 to 40 not 5 - 95 like the manual

2- Using the trigger on 2T I cannot get below 20 amps on a clamp on meter, even though the display on the welder is set to 3 amps. You cannot move fast enough to keep it from burning through the bottom ring of a beer can.

edit: My start and end currents are at 3 amps. balance at 0 and bias at 0