I tried it and it did make it a lot better. I moved my chair nearer to my front speakers. I brought the front speakers a little more away from the wall and put the fronts a little further apart.
Let me ask you this. If I put a thick curtain across the windows, would that help the sound?
Maybe. I would only do that if you find that the audio is a bit too bright, but even then, I don't think your primary LP is that close to the windows. Well, I guess that side couch is, but
you are not sitting there, right?
If it was me, the main reason for curtains could be better ambient light control. But I sort of rather see a subwoofer in there.
How far are you now from the display? I'd try to get to about 7 ft away, to be able to discern the full benefit of 1080p. If your eyes are any less capable than 20/20, then even closer. So, you might consider moving forward some more, and then pushing back the speakers again (assuming the SBIR sounds fine, just google that), so that you can achieve that. Again, it would be nice if you listed any distance measurements at all.
The above would also get you even further away from the surrounds, which would probably be nice.