How to prevent Buddypress Spam?

I've tried everything I could to stop spam on my BuddyPress MU site "atsolutions.org", and I still get spam registrations and groups created daily!
I have a CAPTCHA on the registration form, changed the url from "register" to "create-an-account", installed the "Bad Behavior" and "Stop Spammer Registrations" plugins...
Suggestions are highly appreciated!