I would focus more on the pet than on the hunter. Pulling aggro once in a while, is no big deal, just feign and the hunter should already be behind the druid, which should be way back from the mobs (20-25 yards). For the pet, pick a tenacity pet. Give it:
Charge to get it far out in front also adds damage for next attack.
Culling the herd (use it last like 76-80). It is nice, but not really required compared to other stuff.
Thunderstomp adds AOE damage and should be really repeatable.
It helps if you are BM so the pet gets more focus and has a lower cooldown (Longevity).
Guard dog helps get more threat.
Wild hunt gives more AP which should help with threat.

Those are the ones that help with threat. There are plenty more that help with the pet surviving.
Also you can lead off with smaller attacks and build up. Just for thoughts.

druid:
/castsequence Faerie Fire, Insect Swarm, Moonfire, BiggerSpells

hunter:
/castsequence Hunter's Mark, Serpent Sting, Arcane Shot, BiggerShots

Make sure you make a macro that sends your pet first if you aren't sure about aggro:

For hunter:
#showtooltip
/petattack [@focus-target]
/startattack [@focus-target, combat]
/castsequence Stuff, OtherStuff

For druid:
#showtooltip
/castsequence [combat] Stuff, OtherStuff

You won't have to use it all the time, just when you are sure you want the pet to have aggro.

Hope that helps and good luck.