The reason WAR has more ways to rip hate off you is because we need to keep up a debuff with a combo that has no enmity multiplier, whereas PLD has a strength down debuff attatched to their enmity combo. If a WAR isn't completely horrible, they won't rip hate off you, though. As long as you're using FoF and your enmity combo and I'm cycling between Path, Eye, and (potentially) Fracture along with a few IBs, Unchaineds, Berserks, and Internal Releases I still shouldn't rip hate off you unless I'm way over your gear level.

Also same eHP etc etc, infact you get more eHP with a WAR present as you'll have a constant -10% mitigation on top of your default -20%. So yeah, relax.