Originally Posted by
Scrysis
Our group was 21 people with four healers. I play a holy priest, and looking at your logs, you're going to have to talk to your holy priest. I'm really kind of stunned by the log.
Your holy priest only used Holy Word: Sanctify FOUR TIMES, Halo THREE TIMES, and Prayer of Mending 6 times. Top heals were flash heal, our mastery, Holy Word: Serenity, and Heal (wat.), followed by CoH. I just checked with Raid Leader, and apparently our logs are broken and only recorded the very first boss of the night, so I can't give you comparative numbers, but I can tell you that they're off. Really off.
Prayer of Mending should be on cooldown. ALWAYS. It's a long fight. There should be WAY more than 6 casts given that it has a cooldown of 12 seconds. This is a largely static, ticking dot fight. PoM is KING in these fights since it will keep bouncing.
Holy Word: Sanctify is an incredible heal. After the first minute, that should be on cooldown.
Halo is awesome. It literally heals the whole raid with no cap. After the first 40 seconds, that should be cast on cooldown as the whole raid is going to be taking increasing amounts of damage.
Waaaaayyy too much flash heal and CoH. You're burning through mana. There are no movement components this fight. I highly suggest that your holy priest swap to binding heal as filler and spam that instead of flash heal. Binding heal is more efficient this fight, and you have a holy paladin to prioritize tanks.
This is a long fight. I was able to cast Holy Word: Sanctuary and Divine Hymn TWICE. In this fight, use those cooldowns as a means of stabilizing the raid with lower mana consumption. I used Sanctuary first just as Vectus went into his first transition phase because everyone was roughly around 50% health. The next raid cooldown was when we all got down to 50% again. And I cast them as needed when they came back. This usage is for saving a huge amount of mana.
Also, don't forget about Hymn of Hope.
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Also, you're running into the same problem that our group did. Your first death was to a double omega stack. Your second death was the tank to a triple omega stack. Third death was to a triple stack. That's not a healer problem; that's a "we're screwing up mechanics problem". Healers absolutely cannot compensate for that.
How we solved it:
Three groups spread across the boss' backside. The first three people to get infected would pick a stack different than the others and go hang out in the back of it. Once the Omega infection jumped to the next closest person, they would go back into the stack, and the new infected would head to the back. Rotate as needed, and keep an eye on personal Lingering debuff stacks so that they wouldn't get too high for people. During transition, people with infection would go stand near three (different) markers and people with low stacks would go over there to get a germy hug. Commence stack rotation. Once Vectus goes back into phase 1 again, go back to three stacks.
People with super high stacks would pull out of the group entirely and avoid infected people. This strategy kept Lingering stacks off of the tanks, thus making them easier to heal. I won't lie; it was still a beast to heal through. All the healers were super oom at the end (not to mention that mana potions give virtually nothing back), but we did beat him down. The fact that we didn't steam roll him first thing is nice.