If you're going to give them treats, high protein is better. Hearing what they've been getting, just cutting out the treats may get them to eat enough of their regular feed and help with the molting.
Side story- Mine were in a pretty heavy molt this fall. Its was raining, cold, windy, and gross out. They were all standing in the door of their coop, wet and mad and cold. I spent an hour getting soaked to the bone gathering night crawlers from the driveway for them. Do you think they appreciated it? Sure, for two minutes, then they went back to thinking it was my fault the weather sucked. Morel or the story- so long as they have a full food dish, they really won't care if you bring them treats.