Yay! All the time spent fitting paid off. I have a happy new top now:
This is view F of Simplicity 3697. The biggest change I made from my third muslin was to go from the two outside pleats to a single inverted box pleat in the center (I used this tutorial at BurdaStyle as a guide). I think it looks very clean and is more figure-flattering than the pair of pleats. I also chopped 3" from the bottom to shorten it up a little bit and added a modesty panel (because that V was just a little too low).
The pattern instructions were very easy to follow and seemed pretty well written. No head-scratching moments at all. But I did make a change to the band facing. The method described in the instructions would result in an exposed seam between the band and the bodice (as shown in the diagram above). Since there is a facing there, doing that made no sense to me. So I enclosed the upper seam in the facing as well. So much cleaner.
The fit still isn't perfect. I think I spent so much time focused on the front, I kind of failed to address the back. It isn't bad, but I think it could fit better. I think I may need a broad back adjustment. I'll have to experiment and see what I can do to loosen it up a little back there. I definitely plan to make this top again (it has been suggested to me that it could also be a very cute dress as well with some added length), so the time spent fitting is certainly worth it to me.
I've always wanted to have a top like this, but have never been able to find a ready-to-wear one that even comes close to fitting (they are either tents or boob-crushers or a bit of both...). So I'm thrilled that I was able to make this pattern work for me.
I'm still feeling the sewing mojo... now to decide what to do next!