I had four QS8s - two sides, two rears. Now with two side QS10s, I don't need rears or Atmos.

The QS8s have value; the trade-up store says so. Do yourself a solid and give the QS10s a shot. The QS8s aren't even close!

House of the Rising Sone
Out in the mid or far field
Dedicated mid-woofers are over-rated