Your welds look good. The fix for spatter is practice. The sprays help, you can use PAM cooking spray also. But, playing with your welder and burning wire will help more. You can get the spatter down with method and settings.
I tried all the recommendations out there for welder setting for my aluminum tig work and nothing got me results like I see from pros. Practice and a few lbs. of filler rod did more than changing settings. I found my torch angle was my biggest problem. Weld a bit, change something, see if it works and either go back or try something else.
Fit of your joints is just as important as your welding. Filling gaps will never look as good as a bead across a tight fitting joint. That's also a practice thing.
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