i applaud your continued developments into this, & good luck in trying to reduce this further. though I feel you're fighting a losing battle in relation to human spammers as opposed to bots.

i don't think there's much anybody can do to prevent a human spammer except plenty of vigilance. i don't think disabling posts for 60 minutes will solve it unfortunately, though it's a sure inconvenience to them, it is also an inconvenience to those legitimate users who registered.

i guess thats 1 of the hardest things to weigh up in our fight against spam, spam protection vs user inconvenience, where do you draw the line? tough decisions.