It's a great treat getting the double (and more!) yolkers. I used to find I got more of them when the weather was bad - eventually I worked out that if it was rainy or snowy they stayed in and ate their ad-lib pellets, whereas if it was nice they went out and ranged about. Now I only give them as many pellets as I want them to have in the morning and I get regular-sized eggs (and well-exercised and varied-diet hens.) (And yes I give them more during the day if it's horrid and they can't range.)