I think your best bet is to isolate the mount from the ceiling and bolts. Put neoprene (sp?) between ceiling and any contact points, and put thick soft gaskets or neop on floor side of the anchor bolts.

50/50 chance it gets better. But anchoring it more tightly I thinks is a hard road, unless it is really loose right now. With that much SPL, you won't get all the shake out of the structure, so you have to isolate.

Panny 3000 PJ, 118" Carada, Denon 3300, PS3, Axiom QS8, PSB 5T, B&W sub, levitating speaker wire