Here are the latest pics of the reception dress. With a regular bra and a bit of fiddling around the bust area, the fit was instantly better. I also cut some of the excess fabric out from under the arms. As you can see, the fit is MUCH better than before.
There are still some wrinkles that I can't seem to fix. Releasing the side seams didn't help at all. Maybe take more off the back underarm? I don't know if adding a bit of boning would help? Or if this is as good as it gets? I am a bit of a perfectionist, so I would love the fit to be PERFECT, but I think this is at least livable.