I have been brushing with a SS brush, but it was a Harbor Freight piece in the $1 bin, so quality might be questionable. It seems that there are a lot of personal choices on gas. I'm guessing that a lot of it has to do with technique. I have been using straight Argon, but also have a Ar/CO2 mix that I've been using for my Mig. Maybe I'll try using that.
I immediately noticed that welding steel is a very quiet, gentle process. Aluminum, I'm guessing it has to do with using A/C, is very noisy and seems to be a pretty angry burn. At least it's my perception. I think I'm backing out of the pedal to make it feel like welding steel, but what I am really doing is killing the heat and losing the puddle. I need to learn how to "Stay into the gas pedal". Lol!
And another thing I noticed, aluminum might dissipate heat faster, but it sure does transfer the heat to the rest of the material faster. I can feel it pretty well through the gloves.