>My question is, how do I force the bees down into the deep brood boxes?
Why force them to do anything?http://www.bushfarms.com/beeslazy.htm#stopfightingbees
If you want them back in the deep, and there is no brood in it yet, then just put the deep on top. If there IS brood in it, then they are already moving down. Just put the queen in the deep with that brood, and put an excluder on. Don't restrict the queen anywhere that there isn't open brood.