Have you tried the Frenzy AI mod yet? It gets dull and predictable after a while but it's overwhelming the first few times and it will definitely give you the fight you're looking for (you can download it from the CtP2 files section of Apolyton). Still fairly untested is the MedMod's AI, but I think that, once it's done, it'll turn out to be the best AI you're ever gonna get for CtP2, so I'd keep an eye on that too (you can download the MedMod beta from
Wes's website right here at Apolyton).