First, I believe I figured out what was making me feel all wiggy when listening to music. I was sitting in a highback chair, where the back of my head was totally covered by the back of the chair. Moreover, the back of the chair is concave, rounded inward, so all of these sounds were just pooling around my head, along with whatever funkiness is going on in my room.
I switched chairs. Bam! Instant gratification.
But I also took a page from Timind's playbook. It's not exactly 45 degrees in the room; nevertheless, I'm not battling a square, either. In fact, I flipped the room where my back is now to the windows.
Even cooler, I'm using the two alcoves in my room as the "front wall," basically eliminating the front wall, because now there is no wall behind my speakers. The ports are aimed into a hallway and the kitchen. At least it's cool to me, because now the bass sounds more natural than it ever has with these Dynaudio 340s.
The only problem is - I don't know - it might be a trick of the brain, but I'm still trying to get a stable center image. It's nearly there; it's only a matter of inches (or centimeters) this way or that way. It's just weird, for I'm used to looking at a center in space, on a flat wall, to serve as an imaging guide, but now my seat and the speakers are off-center in the room, so getting a fixed point is a little more difficult, if that makes sense.
Another neat part of this trick is that this arrangement gives me more physical space. Granted, the space is dictated by keeping my speakers within the boundaries of the alcoves, but now I can squeeze a 9' x 9' x 9' equilateral triangle out of this space if I wanted to. Right now everything is about 8.5ft, which is good, because the speakers I ordered are a little bigger.
Here is a little quick view of the room. Obviously acoustic room treatment is in the cards. Any thoughts?