You're heading in the right direction, for sure.
Since you already have a dominant bird issue going, set out multiple feeders so that everybody has a chance, and definitely give the pecked birds time and space to heal away from the bullies. Don't put them in the same cage or they're likely to peck at each other's wounds, but definitely put them near each other for the company (and for your convenience in caring for them). Assuming your birds are on layer feed, it should be around 16% protein, which should be plenty. If you're feeding them scratch, stop, it will dilute your protein percentage. If you want to feed them a treat, feed mealworms, which are 100% protein or close to it, but they shouldn't need a purposeful protein supplement with good layer feed. Be sure everybody has free choice grit, including the birds in your hospital pens, and free choice oyster shell if they're laying.
Beyond that, it's wound care and time to heal, and you should be golden. Make sure you reintroduce your hospital birds at night so they all wake up with new friends. You might want to move the cages into the coop for a day or two before reintroduction so that they can chat each other up a bit before re-entry. They'll have to re-establish the pecking order but if your wounds are healed it shouldn't be anything beyond normal chicken establishment behavior.