Again, it takes practice just like feeding rod. I use a reverse grip in many places, and at 6'2", my hand is large enough to grip and hold whatever I want. Thumb on switch, Index or middle on the knob. Or, a fore hand grip thumb/hand on switch, index or middle rolling the knob. Even if you cannot master it, you can hold the torch in one hand and steady/brace yourself, and turn the knob with the other hand well enough to determine if the pot is working in 2T.

As for the discussion of the chart, that is irrelevant. We've already discussed ad nauseum how this works. Stop being foolish and wasting my time and everyone's time for that matter by NOT playing the same game over and over. I put question marks after my questions which is customary in the English language. I asked you 7 direct questions above. Those are as direct as they can be. I need your settings on each part of the weld cycle to duplicate it and figure out what is going right/wrong and how you are determining the arc or amps do not change. In other words, give full and complete details on how you are attempting to set the torch up, and what amps/time and flow you are using as well as AC or DC etc. Tell me what you observe when you are doing all that. All those come into play if you are trying to trouble shoot it.