I've been trying PLD/DRK out recently in sky. It's a lot better than PLD/WAR for hate. I asked the WHMs and they said the damage I took wasn't different from /WAR. If your ls still blood tanks anything (we do sky god and that's about it), I recommend PLD/DRK.

If they added the ability to half mob's weapon DMG by half I could see /DRK and /RDM being very viable subs. Overall I think /DRK would have more hate, but /RDM you could take almost no damage, kind of like /NIN.