Spend time with them sitting outside very close to their enclosure. When you first apply feed, do it in small amounts. Make them approach you to eat but do not look at them. Can get some live meal worms? They are much more effective at distracting chicks in particular. After you go through an interaction session, then give the amount of feed you think they can consume but try not to over do it. Nothing wrong with having them deplete their crops a couple times per day.
He is in really poor feather and molt of actual body feathers not likely underway yet. I see no evidence for molt beyond flight feathers of wings.
See thread below for some broody rooster stuff.
https://www.backyardchickens.com/threads/what-to-look-for-in-a-broody-rooster.882368/