I also have the 11s with ADP-170s and I can tell you my next purchase will be QS8s. I haven't heard the 5 driver ADP-390 but I have heard the QS8s and they are infinitely better than the 170s (which are actually pretty good, and shall be demoted to system 2: M2/PDR10).

M80s/VP160/QS8s/EP350; M22s; M3s.