Being flock animals, IMO, your 2 "small coop" set up is part of the problem. If they try to crowd together, which is their nature b/c of their flocking behaviors, they are crowded. And if they sleep in 2 separate coops to have the room they need, that brings division to the flock and fosters more pecking order discord. If I were you, I'd sell or otherwise get rid of both of those coops (or save one for brooding chicks in the future) and build at least a 4 x 8 walk in style shed coop. You could attach it to your existing run 'a la mode style to turn it into a mock Woods style coop.
Kitty kibble in small quantities would give them an immediate boost of animal protein. Perhaps when ever you give them any treats that are NOT part of their formulated feed, add some kitty kibble.
Kitty kibble in small quantities would give them an immediate boost of animal protein. Perhaps when ever you give them any treats that are NOT part of their formulated feed, add some kitty kibble.