I would cut all but the layer feed and plain water until all are laying well.Yes they are being fed layer crumbles, scratch grain, grit, mealworms, bok choy and collard greens, and other leafy greens from garden as well as occasionally some scrambled eggs. I do put diatomaceous earth in their treat once a week for worms. I have not seen a soft shelled egg since I created this post but three days ago I noticed what looked like yolk intermixed with one of their droppings.
Treats maybe once a week and in moderation.
DE is going to do nothing for internal parasites, cut that out too.