For Titan extreme, I will say that if all you're only using is a single medica II + medica for first set of stomps, and then a cure III for first geocrush, there is no way you should be pulling hate unless your tank is either under-geared in relation to you, or simply isn't good at maximizing enmity gains. Out of all my attempts, the highest enmity I've gotten after first phase is 50% doing this. Now if you're paired with another WHM then you both don't want to be using cure III for geocrush as that will be overkill, instead 1 should be on Cure III duty and the other should top off with medica to minimize overheal.
I think people tend to forget that WHM is one of the most unforgiving jobs existing right now due to having so many mechanics working against you at all times (both job-based mechanics and enemy-based mechanics). You can't go all out like in other MMOs because tanks don't get nearly the amount of aggro nearly as quick as other games allow.
The key to playing WHM is not knowing when to heal, knowing when NOT to heal. This game as a way of really punishing you for doing your job because WHM is so dependent on the party doing what they need to do. If too many people are getting hit, that's more heals and more enmity. If there's no bard, that's more risk of going OOM if you have to heal unnecessary damage. If the tank isn't doing a good job, that's more risk of you pulling the mobs. WHM requires perfection from all 8 people. If too many people aren't performing at max capacity, I'd recommend switching to SCH as they can cover for people's mistakes better and don't have as much of a problem with mana and enmity.
