I am starting to think that there is a high loss of queens that are vacuumed. I don't see a lot of bees being killed, but seem to end up with too many queenless hives. With swarms, I attempt to shake the bulk of the bees to begin with if possible, and only vacuum the leftovers. So many swarms are completely tangled in bushes and have to be totally vacuumed. Any other vacuumers have an opinion ?