I agree, one deep is not enough room for brood, bet you have excluders on those hives also right, looks like you might? when I started my bee's everybody told me in the south I should only use one deep for brood, I quickly found out this wasn't near enough room, all my half have 2 deeps or a deep and medium for brood, I would give them at least a medium more for brood and also adding ventilation will help anytime.... looks like you need both....