250DX AC Aluminum Weld Issue

[dmost]

This is what I'm getting on 1/8" 6061 aluminum with 4043 filler. Looks awful and I have no idea why. It has a lot of impurities and the weld is very undefined. I have my argon around 15. My settings I'm roughly on are: 125amps, Preflow-3s, Postflow-10s, Freq-150, Balance 90, HF start, No pulse.

I'd love help on this because I bought this machine to mainly weld aluminum and so far I'm screwed. I've been welding 304 Stainless with it for the last 3 weeks and it's been awesome. Just wish aluminum was the same.