A - bearding is normal during the summer to aid in maintaining the hive temperature. Don't try to interfere with this normal process, let them beard. If you need to inspect, do it earlier in the day when the bearding is less.
B - if there are no Q cells, they are not preparing to swarm. However, your description sounds like they are close to being honey bound, which can lead to swarming. Follow the advice as given and remove the QE, and move a couple frames of honey up to the honey super, and move af couple frames from the super to the brood box.
C - All of my hives have both bottom and top entrances. Most of them use both, but one hive uses only the bottom entrance. So what? They can use whichever entrance they prefer, and I'm not here to argue with them!