Thanks for posting the video here.
It took us a while to get the mechanics for Festergut down, and once we had it there hasn't been any trouble with the fight.
Our DPS on Rotface has been very good, so we shouldn't have any trouble with him once we get the mechanics down. Watching this video will help with getting the mechanics down.
One thing I notice in the video was that the off tank picks up the slimes from the middle of the room. The dps or healers don't run away kiting the small slimes. I think when one of the healers gets the slime on them and has to run around wildly, it makes their job difficult. And when a DPS gets it, we lose that DPS temporarily while they kite.
Also, Tankspot says the slime puddles shouldn't affect the kiting tank too much. The tank runs, stops, and then taunts. Then runs, stops, and taunts. Maybe this will keep the slime from reaching the middle of the group. So far I have noticed that this is where the majority of deaths happens. If the tank has to run through slime to keep kiting far enough away, maybe this should be done.
Everyone has to move during the slime spray to mitigate damage and make the healers' job easier.
I know not everyone likes to have a lot of addons running, but the HudMap addon shows you where slime is going to rain down after the explosion, and makes it so you don't run and stand right where someone else was just at. At least for tanks, this will make your life MUCH easier.
I think we can get him this week... and next week have some time to get to Ruby Sanctum and give it a try.
Zalkor (Nick)