So, I guess I was in a mood...
Ripped it out, put in a single, pulled that out, put duals back in, lol.
I actually screwed up the single - forgot to change the diameter in Steam Engine, so it was higher resistance than I meant to land on - about 0.8. It was OK, but didn't particularly change the airflow, and didn't really like the way sat in the middle. It was too high, with longer wick distance - plus, well...it was huge (I went 3mm SS) - I was worried the coil would bump a post...
So I did duals again: 27 gauge kanthal, 2.5 mm, a little under 0.5. But I pulled them in tight, a little closer to center - a little more room inside that airhole.
VERY subtle difference, but I like it. It's just a touch more "sizzley" than my first dual build. A bit more kick. Vapor and flavor both awesome. It's a keeper!