It's common for a WHM to pull hate in Titan around his first or second jump - this is not your fault, and it's what Shroud of Saints is for.

Your WHM will have been trying to conserve Shroud for MP purposes, but once forced to use it for hate purposes it will be popped immediately once off cooldown for the remainder of the fight. (By time its back up it is required to keep MP up regardless).

I have extremely well geared WHM and PLD and I have played both extensively in many, many Titan runs. Trust me, any WHM worth his salt wont be close to your threat after the heart is dead.