I agree that you have space for more. Especially since you free range them. I just built an 8x12 coop and am sorta kicking myself for it. I always free range my birds, I open the door in the morning and they come out and don't go back in until the sun goes down. They've got all that space and all 30 sleep in about 8 square feet of it. That's all that ever gets used. I'm not even building a run for this coop, I just don't see the need with them being able to free range all the time.