You know there's a whole way to run this fight that doesn't ever have a tank w/ 2 on him/her at once ...
DDs grab one add, take to one side
OT grab one add, take to opposite side
MT hold Garuda due north

When "X" storms are up you just shift a little clockwise
Wheel does less damage
They have far less damage resist
On the whole the adds are just easier

An i65 tank can take a hit from an 1 of them at a time as well, so the ilvl set by SE is very doable.
Moral of the story: Just because it is a way that has worked for others does not make it the only way to win. If something simply isn't working, find a way to change.