For thinner stuff, instead of trying to spill over the edges, purposely eat the edges so your bead rolls over the outside^ Oh, cheater! hahaha. 3/16" open corners are still tough though. And 1/8 to 3/16 are really tuff. And 1/8 to 1/8 are really, really tough. Can't imagine doing anything much thinner than with MIG that unless you blend.
I turn it waaay down for open corners. Problem for me is staying perfectly straight with any pattern and not letting it spill over edges.