nuthatched
Orneriness & Co.
That's way too much scratch, any treats should be less than a table spoon per bird, few times a week. If by 'loves it' you mean voraciously eating it, that's a sign that there's not enough nutrients in the feed so they are trying to get as much as possible. 16% layer doesn't have enough nutrition, especially protein, for you modern dual purpose layers, they need atleast 18% protein. If there's a chick starter I'd switch to that add have oyster shell on the side.They get one scoop of scratch to 3 scoops of feed. It’s 16% layer, not sure on nutrition analysis I don’t have an empty bag. I started buying from Amish in the winter, the flock loves it.
I think your flock is suffering from nutrition deficiency and all the reproductive issues that come from it.