Try relocating the sub to a position away from the TV (first of all, not a bad idea, especially if your sub is not magnetically shielded). This will allow you to reposition the speakers without considering the postion of the sub.
2nd, while never a particularly good idea, try moving the speakers closer together. This could sharply reduce the size of the sweet spot and reduce the depth of the sound field, and while this all sounds bad, the closer spacing will reduce the distances between each listener and the respective speakers. It may, just may, improve the sound. My thought in this process of closing up the spacing is that I would achieve a similar sound field to that of sitting in the back of a theater watching/listening to a live production.
Maybe a better idea, get a new set of recliners
one's without the armrests... which would allow you and your friend/lover/wife to sit closer together and enjoy the movie as well as the close proximity to each other.