My guild has been struggling with this. Our best attempt is like 25%, but nothing really good. Pretty much looking for how other people handle the tornadoes and where they put them, and how you move around the room.
Our strat we have been using, which works like a champ in normal is starting at one end of the hall and working our way to the other, after about 2 strikes we move a little. But on heroic, we are almost at the end of the hall and just hitting 35%. For the most part our DPS is good. We were usually all at around 80k with 5DPS 2tanks around 20-30k each and 3 heals with our HPriest doing about 20k dps.
We have a few options for our setup.
Resto Shammy (elemental)
Enhance Shaman (blood DK)
Open to any suggestions on how to do it, or tips and tricks for the fight. Not posting logs cause I already know some things that certain people do wrong, and that's not what I am asking for. Thanks.