What am I doing wrong

[Arc weld]

Normally you don't have to anything with the adjustment.

 

[Mark @ Everlast]

You may be holding too far off and getting a little extra spatter. Tighten up arc to less than 3/8" from contact tip to metal. Also if you are running pure CO2 it will cause more spatter. Otherwise, try turning down the voltage. If you have a tapped machine, this may be hard to do.