I use magma totems and they take care of the tombs.

I run a pala tank + 3 elemental shamans + 1 resto shaman as dedicated healer. My gear is far away from Hachoo's gear... some of my toons still have lvl 65 greens on them, so go figure.

I have chain heal set on a separate button on all the DPS toons, so they can heal through AoE damage or just heal themselves when needed.

The fight goes this way...

1 ) Before going to the boss put earth shield and riptide on the tank, so he can survive the initial damage while the shamans lay the totems down.
2 ) Capitan america shield throw, run to the boss with all shamans following the tank.
3 ) Lay down 4 x magma totem and tank consecrates.
4 ) The DPS toons cast chain heal, this basically fills the tank HP.
5 ) DPS fun starts
6 ) When some toon is frost tombed the magma totems and an ocassional chain lightning do the trick... then just cast chain heal to top all the toons HP and DPS more.

Sure the fight lasts longer... my fights are long ones due to a severe lack of DPS, but as long as my healing power is good everything goes down sooner or later.