The Chukker said:
P.S. I noticed your rack is on wheels, have you tried moving the rack in and your mains out a little further? I wonder how your imaging would be affected...
Funny you should mention that. I haven't updated the pics yet. But a couple weeks ago, on the recommendation of the guys at GIK Acoustics (sent them room pics; they were very friendly and helpful), I pulled the fronts and center spkr forward about a foot. Without the TV in the middle, it improved both imaging and soundstage. I also pushed the chair and sofa back a little more.
I also gave room treatments a shot, per others' suggestions. Got a couple of GIK's 244 panels. Right now they're on the back wall in the corners, but I toyed with them first on the first reflection points. I think the latter had the more noticeable (and better) effect, but the panels were too thick to mount on the side walls (the left side will require a stand in any event, given the cavity). Still trying to figure out what to do there.
The tinkering never stops.