Bob,
I know some of those
Blueshield gases can make the welds hotter and prevent spatter. It may be worth it hook up the gas and use solid wire.
When your welds run and glob up, your speed of travel is too slow, or your heat is too high. If it were me, I would probably speed up some more, or better yet, practice welding downhill. There are well procedures out ther that allow it doing the GMAW process. I do almost all chassis welding with .035 wire in the downhill direction of travel. Just watch the puddle and make sure it stays somewhat egg shaped.