J.B.
It's not ideal using direct-radiating surround speakers in a domestic setup because the dimensions of the room are so relatively small, so you should experiment. The surround speakers should not be "heard" as point sources of sound if your goal is a diffuse sound field. The idea behind Axiom's QS8 multi-directional surrounds is to direct a mix of wide-dispersion reberant information at all angles into the room with some direct sound. The angle you're using for the surrounds is good.
Regards,
Alan
