I have 4 10 month old Khaki Campbells, who through the fall were laying 1 egg each per day. When the cold weather and shorter days set in, they stopped laying altogether. I added some artificial light to give them about 14 hours of light per day. I also changed their feed from 18% protein to 23%. I get on average 1 egg per day total although the last 2 days I got 2. Is there any other way to coax more egg production?