For those who don't want to read the math at the end, here's basically what I say: dps need to up their game (by staying alive would be a good start), with our current setup, we need an average of 12.5k dps (without the damage increase debuff) for the ppl that are on the boss. Pallies, use your bubble at 6-8 stacks of acid rain to cut the damage taken from acid rain in half.
I also watched a bunch of vids, most groups seem to get through the phase in times ranging from 2:40 to 3:10 mins. They also have the tank holding the stormlings.
I'm really not sure what would be best. We might as well give a shot to having me try and solo the adds but I'm not sure how long I could keep up with the killing on time and the dps still need to be on their game. With Holy tanking the adds we might get more overall dps on the boss but we need to control the way we down the adds, can't just aoe them down, needs to focus and time the kills properly. Another option is to try and go down to 2 healers, but I'm not sure what sort of damage to expect in p3...
Here's some math for Al'akir:
He's got 30.5 million health, p2 starts at 80% and p3 starts at 25%, so we need to do 16.775 million damage to get out of p2.
Looking at the logs of our better attempts, it seems that our breaking point is 12-14 stacks of acid rain. So ideally we will want to be in p3 by the time we hit 12 stacks. Acid rain increases every 15 seconds so that gives us 3 minutes in p2.
Stormlings come out every 20 seconds which gives us the 9th by the time we get 12 stacks.
If we start killing adds at the 3rd spawn, that means we have a min without a buff and say we kill them every every 15 seconds we should by up to 8 stacks by the 3 min mark.
If I'm the only one killing the adds then I will be doing next to no dps on the boss (still not sure I can pull it off, they have 300k and I have 15 seconds to kill them, I don't do 20k dps). So that leaves 5 dps and Holy (who does something like 75% of the damage an average dps should be doing). Let's say A is the normal dps of someone, then the damage done over the 3 mins will be (60+15*1.1+...+15*1.8)*A = 234*A. So we need 5.75*234*A = 16775. This means we need our 5 dps doing an average of about 12.5k dps (without the buff), which manage to pull off in most of the other fights.
If we just decided to instantly kill the stormlings and the 10% buff had say, 70% uptime, we could probably manage to pull it off in the 3 mins if every dps did 13k dps... Not much more than the "properly executed" method.
Some acid rain numbers: ticks every second for 500 increasing by 500 every 15 seconds, we resist around 20% of the damage. So that leaves 468k damage to everyone over the 3 mins. 252k for pallies if they bubble at 6 stacks.