Since these are still growing birds, I don't recommend that you cut back on feed in the near future. Leave the feed out all day, and pick it up at night, to keep rats and mice out. The birds need time to learn to forage efficiently, and frankly, most breeds of chickens are not equipped to be...
Welcome to the flock! Nice coop, probably could use some more ventilation, and I'm wondering if that hardware cloth is just stapled on, looks like it in the pic. If so, consider reinforcing it with screws and fender washers or strips of wood. When you say you plan to free range, do you mean they...