What my guild has found, and works best for us, is on phase 1 yogg you go about it like this.
Pretend that this is a circle.
| S |
K - Keepers
S - Sara
e - entrance.
Ok, if this is a circle, mind you I can't make circles cause im terribad at ascii. Everyone will run into the room at point e. Everyone will stay at point e.
They don't move left or right farther than about 6 yards. You stay there, no one gets ranged, no one runs into something else. You can call out clouds over vent people will all see it together.
It's incredibly simple and all the problems with had on phase 1 we had in 25, we're gone in 2 tries and since fixing it we haven't hit a cloud.