Maybe just a last ditch effort.. so I'm going to bump my thread.. I'm wondering how much the ceiling would affect the bass response in the room. Simply put that is one of the main oddities of the room. In the ceiling I have 2 sections where it is about 10 inches lower than the rest of the ceiling. You can see it best in the second picture down.
I was thinking of making my own fiberglass based traps surrounding those top 2 lower points...