Hey Mike
I have it set up for aluminum with the sleeve but even with it, I'm finding that the AL wire gets kinked feeding into the sleeve. It gets worse the faster I have the feed rate and I'm finding the rate needs to be fast. I've been checking online for spool guns and think that's the way to go.
Right now, I've just been fooling around with aluminum scrap I have laying around. About .080 I think or something around that.
You're cruel Nick!
Larry