Hi all mate..

after a very lot of time and prob. outgearing the instance i found my way to win against this instance instead of waiting 15 minutes if i got as the random dungeon :P

Didn't remember from who i saw/read this tactic but is smooth as butter.
After some months trying to made separate macro on toons / different addon for unitframes and for button bar i found this way as the most simple to do.

At the last boss
All buff up
All totem down (if u have shaman ofc :P)
Jump on drake
/leavevehicle with your healer
Assume the control of the fight from your healer (this for the healing macro)
Lift up the other 4 pg a bit (not too much or u can't cure but NOT too close or the sphere in phase 2 will kill your healer as is happen to me on the first try )
Prepare a macro on the healer /cast [target=mouseover] greater heal (ok my healer is a priest - put the big macro u have :P) and place this macro on button 1
Spam button 1 (drakes will hit the boss and your healer will cure ONLY the party member you have the cursor over the unitframe/body)
@phase 2 hit button 2 for imunity from the sphere damage ( so u don't have to move your toon )
Rinse and repeat

Smooth as butter
Simple as..... various months of wiping without using this strategy

Enjoy! http://www.youtube.com/watch?v=3XF5BOmtq24