I would add that asking for these parameters IS important. I cannot tell you how many times people have said "I have tried them all" and still was operator error. Trying them all does not answer our questions about the settings. Unless you have physically matched every possible combination of settings, which is in the millions or more you have not tried them all. Arc force is a major player in spatter control. But these welds are too violent, which says voltage is too high or wire speed is. Likely it is too much voltage at this point. As I said, adjust voltage first, then bring your wire speed to it. If you have an extra hand, have someone adjust the wire speed from low to high while you are welding to dial it in. I agree with the gas flow and gun position thing.
For an example of what these units can do, here is a picture of the 160/200 on 1/4" metal AT 16.5-17 volts with about 190- 200 wire speed with .030 wire.
Attachment 8289Attachment 8290
You said you had experience MIG welding before. It might be helpful to know what exactly you mig welded, what machine(s) you have used, and how long you welded with it(them). I've welded with a pretty broad range of MIGs, so I probably can give you something helpful, or put my finger on something that is not transferring knowledge wise over to this welder.
From the looks of the aluminum mig, it does look like ar/co2 mix instead of pure ar. But you said it is not I believe, so, the next issue would be the brown/black haze. That is from improper shielding no matter how you look at it. And, typically MIG aluminum does have a lot more dirty appearance to it. It's not for a tig weld look, even with single pulse.
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