Elden,
Nice photo.
A further addition to my comments. With the center 2 feet away from the projected image, you are on the margin, which is likely why you find the dialog localized to the center speaker.
Sometimes mounting the center directly above the screen image, aimed down, will help. In many situations like yours, the solution is to run two center speakers in parallel, in mono, one mounted above and one below the screen. They will then form a phantom image of the dialog in the center of the screen. And you can still control the level of the center-channel mix.
Regards,
