When useing plasticel the drone cells can be controlled easily by cutting an
angle cut in the corners about 2 inches.  This 45 degree cut frame needs to
be marked on the top of the frame in the brood area's edge.  You can use hive
tool to remove the drone cells.  If the bees doesn't refill it they will use
it as a walk way.  The queen will have greater movement to the next frame.
Mite and swarm controls helps.  Michael Housel.