Try adding a white light to your coop. In the winter months chickens need artifical light to suppliment the sunlight in order to continue to produce eggs since the days are shorter. they need an average of 8 hrs total I think I read somewhere.
I see you mentioned Cornish X rocks for your meaties. I would advise against that. I have some that were hatched Nov 7 so they are 9 weeks old today. Our plan was to breed them here and continue to raise them. The problem is the fast growing genes do not transfer to their young and once...