I managed spam posts on a web site for years. In the end, we had to remove commenting because it was impossible to keep up. User blocking was a joke. IP blocking didn't really touch the problem, either. Am sharing that to say I understand how hard it is. I think I'm still a little scarred from all the cr*p I read in the deleted comment files all those years. :\
I hope you can find the right formula, and I'm sure people will (should) understand. This is not an easy problem to manage.
no subject
I hope you can find the right formula, and I'm sure people will (should) understand. This is not an easy problem to manage.