kcarlile,
Bridgman is correct in his theory that if you used a dedicated center speaker rather than the TV's speakers, the center would better anchor the soundstage and avoid the off-axis shift of the center material to the left or right.
Something else that will help is an old trick from the early days of stereo. Toe in the left speaker so that it almost faces you at the right end of the couch (and the right speaker so that it almost faces W at the left end of couch). Thus, as you move to the right end of the couch, you shift increasingly off-axis to the right speaker and on-axis to the left. It's like an automatic balance control for either party sitting at opposite ends of the couch.
When you get a dedicated center speaker, its front panel should be the back of a gentle arc described by the fronts of the three speakers.
The combination of these techniques should eliminate the unbalanced nature of your situation (not you and W, by the way!).
Regards,
