I obviously can't speak for any of the aluminum guys, but to work on your timing, manually pulse the current. I find the more I absorb myself in to the work, the more consistent it becomes. When im walking the cup, especially on pipe welding, I will sway my whole body to keep the tempo. if I don't, I get sloppy and uncontrolled. I know that doesn't work for most, but its the only way I can do it.