I see both bad things happening, both moderated posts that shouldn't have been and things that should have been but were not. It is definitely not a matter of "to strong" / "not strong enough".


That said, how do you know people are sockpuppeting? It's really not that easy to pick out, as a forum mod elsewhere I know from experience it's a hard thing to squish.
What makes it hard for you is your admin didn't make the right tools available to moderators. As an admin it has been really easy for me to crush on forums I admin'd in the past. They can get fancy with proxies all they want but if they log in (and can't post without logging in) I will connect every account they use automatically. But most aren't even that smart and think their router or a simple proxy IP that still shows their ISP routing protect their sock accounts. With one click I see every post that came from that source IP/domain/route. Certain parts of detection are involved in login in such a way that defeating them would result in not being able to log in. No escape /evilgrin.