Agreed. PvP gear is not really suited for healer-endurance fights. Anything over 7-8 minutes is pushing it. It is advisable to replace any PvP gear with regular raid gear (gear with +heal, int, spi and mp5). I have 2 pieces of T4 that I still wear instead of my vengeful pieces.
Anyway, this fight will test the healer's ability to raid heal. The bird summons don't really hurt much per hit (1000-1500) but can add up if you're not paying attention. Always keep everyone above 60% hp in case he/she gets targetted for the tossing move that removes 50%. So assign one person to take care of the tank and the other 1-2 healers to pay attention to your raid's HP and only assist on MT.
Edit: Since I didn't see any description on this boss fight, I'll add it in.
This guy is pretty easy once you have the strategy down.
Tank: EZ mode tank and spank
Melee dps: Pure DPS except during electrical storm
Ranged dps: DPS boss during first stage. When birds are summoned, help to kill a few of them to reduce stress on healers
Healers: Boss himself won't do too much damage. However, raid damage will be quite high so watch out for everyone's health.
The boss has several abilities:
Electrical storm - He will toss someone up into the air and use them as a lightning rod. A cloud will form under this person and anyone that is not under the cloud will be zapped for 3500 nature damage per tick. Therefore, it's important to drop anything you're doing and run ASAP.
Summoned birds - Once every minute (I think) he will summon a large bunch of birds that attack the raid randomly. These birds are small and move fast so I recommend for ranged DPS to take a few out to reduce stress on healers before going back to DPSing the boss. Don't click to target them. Use the TAB button or whatever button you have bound to cycle target.
Chain lightning - Once every 15 seconds (I think), he will shoot out a bolt of lightning at a random target for 3500 damage. If anyone else is standing nearby, they will take damage as well. Therefore, you cannot bunch up prematurely to prepare for electrical storm.
Cyclone toss - He will randomly target a raid person and toss them into the air. Upon landing, the target will take 50% damage. Rogues will take much less damage. For druids, just shift to cat form in the air and reshift once you have landed. Mages can slowfall.
Recommended strategy. There are 2 ways to tackle the boss.
1) Everyone spreads out all over the stage. 5 seconds before the electrical cloud appears, everyone moves into melee range ASAP. Once the storm is over, everyone moves back to their respective spots.
2) Everyone stands near the doorway with a 6-7 yard gap in between each other. When the storm appears, look for the black spot on the floor that is formed by the cloud and move there ASAP.
Hope this helps whoever is having trouble.