This is what I'd do, although I don't believe it's possible to have much success with 5 hunters in arena, I would spec them all TBW and start the fight by sending all 5 dps pets after their healer with a mend pet already ticking, then I'd drop 1 frost trap where i stand and wait for their dps to come, when they arrive I'd pop TBW and lay a string of frost traps every ten yards on my way towards the healer/target as I hunt him down and the dps has to work their way through my frost traps behind me giving me a little extra time to start taking down their heals, casters in the back. You have 18 seconds to take down at least 2-3 of them or consider it a loss. 5 pets alone should be able to drop most average healers and definitely rip apart any undergeared healer/player within a short span.

When/if you drop a couple of them before TBW expires you can now take down the others fairly easily with 5 pets, raptor strikes, and immo traps. If they're range classes, they are in for a hurtin. The key is to CC their dps with frost traps, and take a couple down during TBW when you can't be cc'ed yourself.

I'd expect to hang around 1500-1600 with this strategy. You won't be getting your season weapons unless you're extremely skilled, but you will trounce any undergeared and/or uncoordinated team with your dps and ability to not be cc'ed for 18 seconds alone. 1500-1600 doesn't seem like much, but with a comp like this, and 5 boxing them you can't expect amazing things unless you overachieve. I'd be impressed by a 5xhunter squad hanging around 1600.

Now, if you are adamant about specing different, I could only suggest a wyvern sting + scatter shot spec for massive crowd control. I'd use scorpions and viper sting the crud out of the opposing casters (dps to remove them from the fight as serious threats, and healers because they're healers) while trapping/wyvernsting/scattershot the other threats.

Hope i helped some.