We have the same set-up. Mind doesn't budge no matter what I do as well. Still, it's better safe than sorry. As bro daredevil123 have suggested countless of times: Fail-safe it.
I'll post a photo of my fail-safe for my FR-T1 in a while, and hopefully you get something off it. Still watching TV.
EDIT:
Okay, here it is:
Aside from wetting the FR-T1 with water to strengthen the attachment, I also bought a set of Op/Tech Sling Adaptor at CP (only $16) and hooked it into the CR-2 and handstrap eyelets. I know it's a bit of an overkill already but the last thing I wanna do is crying over my broken equipment. In public.
Here's a good thread for your reference:
http://www.clubsnap.com/forums/threads/843408-Black-Rapid-RS4?highlight=blackrapid