Welcome back SD,
I'll throw in my $0.02. My QS8's are mounted on the Axiom stands at ear level. The surround field they produce is excellent. To be honest, I have never heard the QS8's setup in a different arrangement. I wouldn't be too worried about their performance at your new configuration. I recently purchased a new AVR (Denon AVR-X2200W) and TV (70" LG 70UF7700). The Audyssey setup on the Denon is fabulous. I am hearing passages in music I have never heard before with the QS8's.
Cheers,
Shaun