Still a lot of spam

Hi, i've the anti splog plugin, but i still get a lot of spam blogs&post. The plugin works, i've set recaptcha + 2 blogs per ip /day, but nothing...i've too much spam :slight_frown: every hour there are spam posts... i spam them, but everyday is the same
any hint to solve this ?

(i don't change the signup page because it'd need changes to the templates&buddypress)