When I said the damage was low, I meant once the tanks get the hang of avoiding combo hits (when I comment about healing requirements, I tend to assume the fight is being done properly, whatever fight it is). If they don't, you can't kill the fight anyway. There are some good videos, and LFR is perfect practice. Also the new DBM is really cheaty because it shouts which way to go now, if you're a tank or melee.
Akee, I'd certainly have all DPS focus on adds. Their spawn rate is constant throughout the fight, so as long as you stay on top of them, you'll kill it.
Should always kill Rages first, because they die really fast, and because if they fixate on a healer you'll have real trouble. Also their fixating on ranged players reduced their DPS whilst they faff around kiting. Get them out of the way ASAP.
If you have a melee DPS with a taunt, they can helpfully keep the Strengths away from the healers until the DPS get round to killing them.
You get a second or two when a Courage lands to put DoTs on it before the shield appears. If you start a channelled spell (Warlocks, SPriests), you can finish the channel through the shield.
The gas phases are the times that most people will do most of their boss damage, because the adds stop spawning. Tanks need to use some cooldowns here, because the healers have to heal the raid.
I wouldn't even think about taking 3 healers. Mostly because you want the DPS to stay on top of add spwans, but also because the third healer wouldn't have anything to do. The damage is much lower than Elegon, which you just 2-healed fine.
If the tanks can avoid combo, and the DPS can kill the adds before the next wave spawns, it's one of the most straightforward fights of this tier. You'll be fine.