I'll tell you what else I did...I cut their feed ration by over half. If they can sit outside the door all day until evening, waiting for that ration...I concluded they must not be all that hungry. So, I cut rations and they are returning to normal free range behavior of constantly foraging instead of sitting by the back door waiting for food. I've always fed in the evenings for a free range flock but have never experienced this phenomenon of their sitting and waiting for the food instead of foraging. Must be the FF..it's the only thing I've changed.
This also tells me it's a more complete nutrition or they wouldn't be sitting and waiting for food. When I fed dry they are constantly foraging, daylight to dark, so I'm thinking it was because the dry feed lacked valuable nutrients and the proper protein amounts.
So, my solution was to cut amounts until they needed to go forage, even with the FF supplement given. It's working out great, everyone seems to have a full crop and not be suffering too much from the heat. Wish I had done this all summer long....