Hi ajplmama,
I had the same thing happen with my muscovies when they started getting those feathers. I had one little drake that was very agressive with the others and picking their feathers. I ended up separating him for two weeks, to give them time to grow in their feathers. It worked.
Also, this same little agressive drake started looking like he might have had angel wing starting. His right wing started dragging very badly, on the ground. I didn't want to try and wrap it, as this duck is such a spaz anyway. I decided that maybe the weight of the feathers growing in was what caused it to start dragging. I thought perhaps maybe he wasn't strong enough to keep that wing up, so I ended up clipping his new feathers on that wing. It lightened it up enough that he was able to hold it up and it no longer drags on the ground. He seems to be okay. He is still such a spaz though!! LOL I call him "Speedy" as he runs really fast and is always on the "go".
Good luck with your ducklings.
Kathy
