The danger with feeding too much right now is that they get honeybound. If they have a lot of "honey" stored in the bottom box, it is time to stop feeding otherwise you might end up with a swarm.
I've been wondering about cause and effect on the "honeybound" issue. Do the bees, who may have lots of space in a super, just get confused and put the honey in the brood nest? And that causes a swarm?
Or is it that the bees were already planning to swarm and they move honey and diluted honey into brood space (which is no longer needed for brood since they are swarming) so it will be convenient for gorging as they leave the hive?
I find it hard to believe the bees would mess up the brood nest if they wanted to stay.