Damping the panels removes resonance issues, rendering mass as mass. The resonance is defined by density and panel thickness, however, resonate it will.
I've been testing these systems in formal labs (Orfield and Riverbank) using ASTM standardized testing since 2004 so when I suggest these things, I'm pretty comfortable that we're beyond subjective and anecdotal.
Obviously you're well underway with construction, so please understand that when I post comments, it's for the thousands that will read this thread years from now.
The Soundproofing Company