Originally Posted by
gavin
Think yourself lucky that you have a couple of powerful ones, HE. Robbing? Is there any kind of fuss at the entrance? Bees with a furtive look about them? Dowsing bees at the entrance with flour can reveal where they're coming from. Always a fun thing to do. Reducing the entrance to one bee-way or taking the weak one(s) away might be a cure. Or it could be that the slow build-up just means there isn't much forage where you are at the moment. Bell heather looks good in the hills around here, but is it damp enough for a flow?
Yes, I'd do paper and the weak one over the super of the other. Super bees are less likely to fight. Shuffle the frames down after a week.
I'd bet that the egg in the cell in the super came from a worker. There are reports though of strange things like eggs presented to queenless colonies on straws giving rise to patches of worker brood and Q cells.