Aye it's impossible to reliably keep hate set on the Mogs, part of it is hate doesn't reset when you initially kill the mogs so all DD's already have a leg up on you in hate. Another reason is as Alerith said some have hate resets (King and Wiskerwall I believe). And to be perfectly honest, you don't want every mog on you at the 2hr mark just most of them. I say this because it's WAY too easy for them to clean your clock even to get off flash or rampart off (specially where some of them do set damage regardless of defense).