To be honest, I've been falling down on my testing duties, so I can't really speak to how good (or not good) Jitte is these days... But the thought is that it would help mostly against Zoo, Goblins, stuff like that... to an extent. I seem to recall having some real problems getting a Jitte equipped in these match-ups though, so you may be on to something.
Anyhow, what would you replace these two slots with?