Last one looks best. I'd go up to 7.5 and lower wire speed to 190. Leave voltage where it is. The reason you are getting the smoked appearance is partly because of the CO2 and the other two parts....One is because of your gun angle is forcing it uphill( notice the spatter on the up hill side?) You may be holding 90 in one plane but angling it on the other so that the arc is pushing up rather than forward. The other is because you haven't ground the metal to lay a clean pass. Wire wheels don't cut it...all you are doing is polishing mill scale...sort of like polishing pooh.
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