* I'm not sure I understand how a hunter's threat should be an issue when hunters have misdirect and feign death. Said hunter should be using those abilities. Often.
* You can also keep an eye on omen and put vig on whoever currently has the highest threat.
* I think you should just go with a straight-up tank weapon, or at least a much slower dps weapon. Perhaps someone else will weigh in on that one.
* Eating some expertise food would probably help your threat.