I have an Epson 3500 projector mounted on a 2'x2' universal ceiling grid mount (https://www.amazon.com/gp/product/B007Z4R7EQ/ref=oh_aui_search_detailpage?ie=UTF8&psc=1). It works great and the theater is coming along great. My only issue is when people are upstairs walking around the projector...

Greetings, I got my Sony VPL-HW40ES mounted on a Peerless mount, lagged into a joist and when the AC unit runs I get some vibration in the picture. The AC unit is about 8 feet away and in the attic. Some kind of vibration isolation? Rubber bushings some how? Tie the joist to others with...