Have you tried these?
GreenStuf® Autex Soffit & Slab Liner (ASL)
Designed as a thermal and acoustic lining for concrete soffits, slabs and car park ceilings.
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.