Edit. I thought that I'd posted this in the questions but ended up in General. So I thought I'd tag Matt Hayden in case he doesn't see it here.
Not real crazy about what I saw when cut and etched some sample 2F welds with the dual shield at 25V/250 IPM 35 CFH C25. They look OK on the surface, but about zero root fusion, and pretty shallow penetration. The etch wasn't great and didn't photo well. The 1/4" material was spotless clean and square; no rounded over sheared rolled edges. It was belt sanded square. Maybe I was traveling a little too fast? The throat is definitely under 1/4". Thoughts anyone?
Photo 1 cross section is pull beads top left/bottom right, and pull top right/bottom left. Photo 2 is pull, and Photo 3 is push.
Edit to add: Not sure what the hell is going on. Ran two more beads. Photo 4 is 25/250 and photo 5 is the Auto Set suggested 22.9/265. Slower travel speed to build up a bigger bead, which it did, but as you can see in the last photo, the root fusion in both is terrible. Squashed it in the 40T press and it held up OK, but I would hope so, welded on both sides.