My 6 E.E. girls have held steady and provide 4-5 eggs a day, of course they are only 9 months old.
They get light from 1 am til 5 pm (16 hrs). They are allowed out to free-range AFTER I get my eggs! I am not hunting for hidden eggs - Easter is fun, looking for eggs is not! I think they know they get to go forage after they lay, because I had 5 eggs at 9 AM today!
My hens have layer crumble mixed with oyster shell in a feeder and water, both in the house and outside. I do sprinkle Cayenne pepper on the food too - something I read about and I think it did help production increase from 2-3 to 4-5. The eggs are nicely shelled with no bumps or deposits, so the mix of oyster shell and food must be right.
I have had people trying to buy eggs from me that have their own chickens, so I think quite a few are having a slow time.