I know it works on WiFi, but WiFi is not a supported method of connection for vj. The supported connection is ethernet, because I'm sure they knew performance would rely on your network and it could perform poorly if the network isn't bulletproof. Can you try hard wiring your ps3?
Sadly I really can't unless I drill a hole in my ceiling. When I got my house I had my den set up as the entertainment room but things change and my PS3 is literally right above on my router on the next level up.