In hindsight, I think the last one, in a straight size 14 E/F, really came out well. But hypercritical me just could not leave it alone. I found the bodice a little low-cut and there were some small wrinkles above my bust. I also felt the sleeves were too tight and that the bodice was a bit tight across my upper back waist.
Looking at these photos, I think it's got to be the sleeve that's the issue. I didn't modify the size 14 armhole, but just stretched it to fit the 16 sleeve. Maybe that's the problem? I don't really know, so please comment if you have ideas! The sleeve is also strangely twisty - when I put the dress on I have to shrug my shoulders with my arms straight out in front of me, and turn my wrists inward to get the sleeve to untwist. I have no idea why. I did not sew the sleeves on backwards (I checked and rechecked), and I'm at a loss.
On the plus side, my modification of cutting both front pieces the same width (instead of trimming the under layer), gave me more security in the skirt. I also added 4.5" to the waist tie pattern piece on the fold, which gave me the longer sash that I prefer for bow-tying. And my 1" lengthening of the skirt allowed me to sew a hem this time. I didn't lengthen (or hem) the sleeves, though.
This dress does fit better (i.e. not as tightly) across the back.