You might also consider the time of year. A month ago I was averaging 4-5 eggs a day from my seven birds, and now it's like two--and one bird is still putting out five a week, so the others are really slacking off! I think mostly it's the darkness, then there's the fact that most of them are regrowing feathers, and there are far too many cockerels (still too young to process, and the second coop isn't finished yet) which adds insanity and stress. there could be lots of reasons that you aren't getting the eggs you expect. I know I was feeding scratch as the main food until I learned better and the egg laying increased pretty fast when I switched to layer rations, so that's a good first step. 
Also, if you need the eggs, you can put a light in the coop set to come on at four or so in the morning, and that can trick their systems into thinking it's summer and lay more eggs. Some people do this as a matter of course, others prefer to let their girls have a break during the winter. I'll probably add a light once the extra birds are thinned out one way or another, and their feathers all appear to be grown back in as both of these can stress out the bird's body. Good luck!