i just recently had the same problem, really frustrating aint it.
we dont have as many chucks as you, but ours went through the molt as normal during the winter
and then when the spring started to come in they went of laying.
at that time i went over everything in my head to see that i hadnt missed out on anything or done anything wrong.
i couldnt think of anything.
at that time i remember i was mixing corn with their pellets and for a couple of days i was just giving them corn as we had no layer pellets.
i quickly got a bag of layer pellets and stopped mixing in the corn, after a couple of days the egg production increased again.
i dont know if this is going to be of any help, or if i have just been waffling on.
hope it gets sorted out soon.
let us know
langdon