Wescott, I thought I'd post up an update.
I have been experimenting with positions for the center channel speaker as well as seating. The center channel is now under the screen (where it looks the best) and this puts the tweeter 8" closer to the center of the screen. I had not used this position because the fear of bloom from a cabinet like enclosure, to my surprise it sounds great there!
Also, we have tried moving the couch forward. Two things happened here.
1st. We are able to get much closer to the THX veiwing distance for our screen size.
2nd. This has made me want to get that rack moved. The closer seating position does flatten the sound out really well. It also moves us out of the null zone for our bi-pole surrounds. I switched them back to di-pole and am very happy with the SQ. However, the location of the rack is preventing being able to move the mains closer together, leaving stereo imaging a mess. So I'm going to bite the bullet on a longer HDMI soon to get the rack moved.
Thanks for the advice,
-Bryan