Hi Mike,
Swapping rooms was a challenge.
Your previous room was really nice from an acoustic point of view.
All rooms interact with sound.
In the context of reproduced music, those interactions will always be destructive.
So when setting up an audio system, the one thing we should have in mind is the room.
The smaller the room, the bigger the problems.
The math is easy to make and offers some predictability.
Size matters. Size and distances matter a lot!
That leads us to your question, what to do with the ceiling?
Not sure I can be of any help unless you’re willing to follow a path similar to @NigelB 's.