Acoustics experts - a little help please

I have 3 48x24x6 bass traps above my listening position. I plan to add diffusion above the speakers. It partly depends on your flooring. With carpet, the diffusion is more important but if you have hard floors the ceiling cloud helps a lot. 

It really depends on what is going on in your room.  If your speakers tend to run "hot" up top you may need absorption on the ceiling. If the speakers run dull or even warm, diffusion may get you there. 

@maprik  What are the other dimensions of your room?

The room is actually 2 rooms joined. My music room and a dining room with a large opening between them. Essentially no left wall for the left speaker and the right wall is about 8 feet from the right speaker. There is a bany grand piano that helps with defraction of the right speaker. Floor is hardwood but I have a nice thick rug and pad under that. See system photos.  

Room is 30 x 18 x 9