Luc, some suggestions after looking at your pictures. The M22 tweeters are way too high; try turning the M22s upside-down with the tweeters on the bottom to put them closer to ear level. Possibly also tilt them slightly downward to point at your ears.
The center speaker shouldn't be blocked by the TV. Even with the narrow top of the TV it may well be feasible to place the VP100 there(with adhesive)so that it's at least even with the screen, or better, slightly in front.
Yes, the QSs in the same position as your present surrounds would be good. As a suggestion for more dispersed surround sound now, instead of toeing them in, point them directly outward to bounce off the side walls.
