Micah, I'm certainly not an expert but I would try rerunning the Audyssey setup. I would also try the phase switch to see it you get better sound at either 0 or 180.

M80v2,EP500v2,VP150v2,4xQS8v2,Algonquins V3
Denon 3808CI
Oppo BDP-83
LG 55LW6500