My ISA's were hatched around March 30. The first one layed an egg on July 27, about 17-1/2 weeks old. They are now 23 weeks old. I have about 65-75% laying, but now every day. Yesterday I got 17, today I got 9...from 23 girls. And they are not laying the large eggs I expected. My RIR's generally ramp up to a x-large to jumbo size by about 3 weeks after they start laying. The ISA's are still hovering around the medium to large size, and they don't lay every day. I'm feeding Layena, they are in a large run and very generous coop. They get some kitchen scraps, but I don't overdo it, they don't even get scraps every day...just when I have some leftovers in the kitchen. So their protein and balanced diet is not being tampered with. They have fresh water both from nipple waterers as well as bowls when the weather is hot. Mostly I'm asking because I've looked at the Hendrix Genetics website and at 23 weeks they state 91% laying and egg weight at about 56 grams. I realize that I am not using commercial methods to raise the birds, but I was expecting a bit larger egg and a bit more regularity by now. I'm also worried that the days are now getting shorter and the girls will slow down as a natural course of events. In the past I have not added extra light or heat to the coop (mostly dual purpose breeds). I'd like to hear from others with ISA's. Am I doing something wrong?