Bryan, I know your room and that QS8 setting is not unreasonable. I am a little surprised at the VP150 but again it is not unreasonable for your large open room. I suspect a little aiming of the VP150 might be in order, higher or lower and you might be able to get the frequency to drop a little not that you should be concerened, the VP180 will be the one taking it's place shortly.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70