@Hookaloop I think we're talking about different things. I don't mean the edge texture or that it's tight at the turn. I mean I'm increasing incorrectly so it was growing too quickly, then I corrected badly and it started almost... decreasing? So the edge is funny but flat. I think I have it now. I was adding an extra chain which resulted in an extra repeat on the turn. Oops.
I'm taking the taller stitch advice with me for future projects though. Thank you!