If you can get some pallets up on blocks, it is a quick and cheap way to make more room for your flock, it doubles the space as chickens can get under or on top of it, and they can get out of sight of other chickens.
You mention that you have a roo. It might be very well that his technique is not the best, especially if you are noticing breakage on the shoulders and back. Bare backs bother people more than chickens. My hens looked horrible when I had Captain, but they loved him, and he was a great predator protector. So a toss up.
I do agree, molt looks like a feather fight has taken place, they quit laying, and look like hell. I add a little serving of cat food, or meat once a week when they get this way.
Mrs K