Guess what I discovered this morning... Probably not the best build technique to taper your root edge! Jeez! Got my delta fins turned around in my mind and/or wasn't paying too much attention as I am building three in parallel.
Best thing is that they are delta fins. I might be able to flip 'em over, maybe cut a bit off the new trailing edge and be fine (and save myself a trip to the hobby store). I'll have to sim with some slightly smaller fins just to make sure.