Mine stay out all night, but the size of the cluster varies. You can put popsicle sticks or similar under the inner lid, on the edge of the box, and they can increase ventilation there. If ants are a problem, that problem will get bigger. You can open the front entrance more. You can add another super, if there is a flow still going on, or SHB is no problem. The more empty space in the hive, the worse the SHB become. It's all a balance.
Personally, I like seeing the beard.