After four years of stick welding, I finally got a Hobart 175 MIG. It came with .030" flux core wire. I used the spool up and it worked great. I went to Walmart and bought another spool, but all they had was .035". That wire worked great too, but I finally got my bottle filled (75/25 mix) so I could use solid core wire. Since I had extra .035" tips, I bought .035" solid core wire. Well now my welds suck. They look like I am not getting enough penetration, no matter how the welder is adjusted. I couldn't figure it out, so I tried it again with the flux wire, worked fine. Is the solid wire too big? Should I go with .030" solid core?