hi all hope this isn't a daft question but ive had this for along time and I know my hens can lay a bigger egg as they have done previously , basically my eggs are all on the small side hens are approx a good year old now and there diet is layers pellets in feeders all time I throw a hand full of crushed maize in run every other day also greens and scraps but eggs are small ive tried different make layers all the same the only time ive noticed bigger eggs is when I put them in a smaller pen which was still 15m by 10m the eggs went huge do you have any tips on how I can at least get normal size eggs oh they have gallons of fresh water daily too .