Hey there Neighbor!
I had a situation kinda similar to yours longarm. All I can say is, be careful. I combined 2+ full deeps of bees and brood into 2 deep boxes on May 5. A week later I opened the brood by adding 3 empty frames in each box, and added a 3rd deep with drawn comb and some foundation. I figured they'd expand the brood into the deep and start storing nectar too, figuring the flow began June 1. May 21 I added an empty western. They occuppied it 1 week later but didn't do anything. Last week, still nothing, but they were living up there. Then Friday they threw a humongous swarm. I checked the top deep and it was all capped honey. The other 2 deeps were some capped brood and nectar, still a bunch of bees remained. I swapped the honey deep with the western and they're working on the western now. Just keep tabs on those brood boxes longarm because if they're crowded and still not moving up then it should make you wonder, this is one nice nectar flow going on right now. Then again maybe they're not as crowded as you think.