I second Alans suggestion,

right now I have an M3 mounted above and below my 92" screen. The centre channel is certainly coming from the "centre" of the screen.

If you could swing another VP150 (or VP100 for that matter) I would mount it on the wall above where your projected image comes in, it will make a HUGE difference, I can't even localize the sound whatsoever, even off axis the sound still sounds like it is coming from the centre of the screen.

-Hutz

Producer | Composer
www.robbhutzal.com