I live in Hawaii, so sunlight hours don't vary a lot in the winter months. My hens range in age from 4 months to 3 years. December 2016 we got 1400 eggs, December 2017 we got 1250. No illnesses ever, had dry pox last year, small amount. We've got only a handful molting this year.
They also free range and have access to an abundance of greens, bugs, etc.
Our goal of not feeding commercial is not only financial. There is a large contingency here on the island that want grain-free eggs and poultry. I aim to fill that niche.
No options for locally mixed feed, no grainery on the island. 50 pound bags of Purina Layena run nearly close to $30 here. Out of my price range. I used to buy DuMoore, but it had way too much corn in it for just over $20 a bag, buying a pallet at a time. I still buy feed as we also have 200+ ducks that get commercial feed. One project at a time.
I came across this web site that may or may not help you http://hopecentric.com/grain-free-chicken-feed/