Sorry, old photo. New one below.
I appreciate the comments. What I've done so far.
1. Behind the blackout curtain, on the left, I installed a 2inch thick absorption panel. Since no reflections on the right, I tried eliminating the reflections on the left. I can't hear a difference but it is there.
2. I pulled the speakers out farther from the wall (on to the carpet). They are now about 5 feet from the front wall and 11 feet from the MLP. I'm actually pretty impressed with the improvement in soundstage depth (important for me as I listen to classical music).
3. Yes, they are toed-in.
James, yes! I will be speaking with you soon about all of this and more bass traps. I am currently installing upgraded crossovers to my SVS Ultra speakers (see GR Research circle). For testing purposes, I pulled off my back wall a couple of impression series panels that I will put near the left and right speakers to see if that makes a significant improvement in symmetry. Once the speaker upgrade is done I will run REW to produce some measurements. We will go from there.
Thanks again everyone.