Current workable tactic:
Tank him in the centre of the area. Give the tank time to get aggro before dpsing.
Everyone is spread as evenly as possible (to start with at least) around him (all the way around him.
There is no set direction to run, if you are targeted just make sure you move asap. If you are near the targetted then run away from them until you know they aren't coming for you.
When he takes off for the air phase
EVERYONE needs to be moving, no excuses, no squeezing out a couple of extra casts.
BE AWAKE. Standing still will likely get you deaded and annoy the gong hitter. People need to keep moving to avoid the missiles, fire etc.
It is a very easy fight if you can move and avoid dmg. Last night we got to 14% with half the raid dead and only got killed because of the soft enrage (ran out of gongs). We would have easily done it if everyone was moving at the start of the air phase.
DPS isn't the issue here, making sure you don't get hit by 'stuff' is.
I'm not raiding tonight as I'm working late, but I expect him to be dead.
p.s. I was very impressed and happy with the raid last night, good job all.