I have 4 BO that started laying double yolkers at 2.6 oz when they first started, which is expected some times at first. Now they have been laying between 1.5 and 1.9 oz eggs consistently since June. I feed them the same as I did before with layer feed in the morning, mixed grains at mid morning, fruit and vegetable leftovers in the afternoon and layer feed at late afternoon with mealworms twice a week that I raise myself they also free range all day. The chickens are six months old. What size egg should I expect from them?