Major problem I can't figure out related to final boss of The Vault.

[h0tNstilettos]

I'm going to start by saying I will never step foot in this dungeon again as an AST until the issue is solved. Never had any issues in duties until now.

So I just did the Vault for the first time. Keep in mind I'm an AST with an average iLv of 134. Everything seemed easy at first until the final boss....I don't even know where to begin. I'm still in disbelief. That was the single hardest battle I have experienced in the history of the game since ARR beta, and as a healer, even harder than coil turns. On the part after we kill the orbs and he starts doing that room wide AOE for massive damage, you are expected to heal the entire party with instant heals AND constantly move to break chains, avoid charging knights, avoid circular AOEs, etc. We wiped 4 or 5 times before barely clearing with only 2 alive with little health. I'm lucky I was with a very kind group that did not kick me and never got angry as they made suggestions to see if it would help in each attempt.

I have no idea if the issue is related to my gear or the gear of those I was healing, or if AST simply needs to be buffed so it is on par with WHM and SCH. The tank was level 60, and the others were level 58. I'm 57.

Here is the issue: As an AST not only is your heal potency already lower than WHM and SCH, but if you want instant AOE heals you have to pop Lightspeed. But Lightspeed lowers your potency even more by 25%. And Swiftcast is not an option because that only gives you 1 instant heal in a part of the fight that demands constant fast AOE heals back to back just to be able to keep up with incoming damage from the room wide nuke that hits every 3 seconds. And another reason you need instant heals is because you cannot stand in place during this part of fight because you always have to move to avoid stuff. The only instant heal AST has outside of using Lightspeed is Aspected Benefic, and even with the buff from Nocturnal or Diurnal, it still isn't enough related to the amount of damage incoming on that phase and it only targets 1 player.

So the issue is either the gear, AST, or the boss itself. I doubt it's the boss, so it's either my gear, their gear, or the job.

My gear iLv looks like this (avg iLv134):
weapon NQ 139
head HQ 139
body HQ 139
hands HQ 133
waist HQ 133
legs HQ 139
feet HQ 139
necklace HQ 139
earrings HQ 139
bracelets HQ 115
ring GREEN 130
ring HQ 125

Could it be a combination of all of those issues with them being higher level as higher level peeps are already more difficult to heal when you're a lower level healer than them, plus the gear?