Regarding the OP and fellow using high heat and welding fast to minimize heat, I think that's usually a better way to weld. I don't know about 140A on 16g sheetmetal, but I use about 60A+ when I'm welding SS tube on headers and exhaust.
I've found that I get a better weld, with more penetration when I used torch movement to control heat along with amperage. I think that's true in general, and I've been making a real effort to increase my travel speed along with higher amperage.
Like others have said, there are probably lots of "correct" ways to weld.
