Danny..."something cathartic about pulsed tig"...Sounds like you've done enough to recognize that. To me...I think I feel it or hear it but when I'm on target, you just know. An old welder that taught me a few things said it "sings" to him.
I sold my Miller Tag. I just didn't use it enough to justify keeping it. The Mig ? I use it all the time.
When Mig welding aluminum (spool gun attachment) I use 100% argon, 5356 aluminum wire (.030). You can use the more popular 4043 wire if you want but the 5356 is stiffer and seems to go thru better. If using the 4043, use a copper .035 gun tip with it. Also don't be afraid to set up the feed speed to maximum then back off if needed. This is where a lot of people get in trouble. Insufficient supply of filler rod is hard to figure out that this is what is needed..........Bruce