I currently have 8 barred rock and 3 Rhode Island reds. They were hatched in February and all but 1 is laying. I would like to add 4 more chickens to the flock. Our coop is 5x10 with a 10x10 run. The chickens free range most of the time and only use the coop to sleep and lay. Would this be ok even though it's a little small?? They have plenty of room to roost.