Honestly, hate loss isn't always all your fault. Titan should have the same rotation as other bosses.. as others have mentioned, use Circle of Scorn and Spirits Within off CD. Flash, and do your regular threat combo. When we do FC runs our dps won't start in until I've shield lobbed, flashed x 2, and then gotten off one of the hate combos. Healers will generally start off with Stoneshield on me to take a tiny bit of the edge off, and I'll generally pop a CD (it'll be a while before Mountain Buster anyway), just to keep hate down initially.

WHM will need to be using their Shroud (and often during this one as tons of aoe healing is going out), and DPS should be watching hate and using appropriate skills to scale back if need be (such as quelling strikes). I've never had issues with a Scholar pulling aggro, and I'm not sure what they have for hate reduction, so no comments there.