BuddyPress.org

I spent some time yesterday to try to stop the constant flow of spam users and blogs being created on my site. Here is what I did…
1- deleted extra registration.php in bbpress folder
2- changed reg. slug
3- installed humanity
4- installed Si Captcha
5- added code from above to htaccess

I am still get about 20-30 per day.
Is there a way to tell if these are humans or bots creating these accounts and blogs?
I don’t know what else to do, any ideas? ( I really don’t want to disable blog creation during registration)