Anti-Splog catching a lot of false positives

Hi,

I seem to be getting a large amount of false positives caught by Anti-Splog recently, with fairly innocent looking blog names including:

timgroves
hawthornpupilblog
greenlanes
primary3r
parkfieldyear4

They all show up as 100% Splog Certainty.

I'm not using any pattern matching that would catch these type of sub-domains but there are aren't any other options that I can tweak to lower the certainty. Is it due to them signing up on one IP address in schools?

Cheers,

Ed