Have you tried these?
GreenStuf® Baffleblock™
Acoustically designed to be layer stacked above partition walls to reduce sound from moving through ceiling cavities.
GreenStuf® Autex Acoustic Blanket (AAB)
Designed to reduce and control reverberated noise in building interiors, ideally suited for use as an absorber behind acoustic panels and ceiling systems.
GreenStuf® Acoustic Sound Blanket (ASB)
GreenStuf® Acoustic Sound Blanket (ASB) is an acoustic ceiling overlay to help make spaces quieter in commercial applications.