Sounds like you need to reduce the population too, otherwise they will build right back up rather quickly. I would either make some more nucs, or take frames with bees away. Actually I would move them to 10 frame hives so they get strong enough for winter, but I guess that is not an option.
I'm waiting for my 10-frame equipment to be delivered (currently out of stock), so unfortunately, I have no place to put them.
Will the other hives accept nurse bees? I did a switch once recently on the nuc that swarmed (didn't see a queen, wanted to make sure the nuc had eggs), and found a pile of dead bees outside the strong hive the next day...figured it was the "intruders" that got killed off. I guess it reduces the nuc population regardless, but I don't want to waste bees.