A suggestion for Festergut should you have the DPS to down him but lack the healing is to stack the healers on top of the tank to eliminate the barfing and moving for them. You will lose some DPS due to the ranged DPS doing it more often instead.
What is the list of Mods you use to heal? I personally only use: Deadlyboss mods, xperl, barender... that bar system looks interesting and the whole setup seems clean cut(from the video). I heal with a Restro Shaman on Madoran(horde) and was looking for some cool mods to help me out. My group of friends have done a couple of ICC runs and got past Saurfang... but can't knock out Rotface and the other dude which I have forgotten the spelling to. If you mind giving me your list of mods you use on that video, I would gladly appreciate it. (question for Aliena)