You can farm these easily with 1 warrior and 1 priest(level 60), you dont need or want 12 people there sharing the loot. The Arcane Chim reflects some of your DOT spells back at you, so you can avoid the stackable DOT's completely by not casting a DOT at them. The priest just wands and heals and the warrior whacks away at it. They have more health than the level 60 elite demons at winterspring but there is actually less intensive healing required on the tank meaning a paladin could probably have coped with the healing. The non arcane ones have no particular special secondary attack that causes problems, although I should stress that I have kept the priest at maximum range to avoid AOE or cleave type attacks.
They are good fun as you dont often get to kill stuff at level 62 elite with 29000 health with just 2 characters.

This is part of the quest line that begins in cenarion hold, silithus and leads to the scepter for AQ

I was unaware of this quest but me and some guildies went out to start farming these tenderloins. Found they had about a 25% droprate and are easily farmed with 2 or more people. The named has a nasty spell though. Non-removable DOT that stacks, you pretty much want to have your melee run in toss a few shots then back off to heal, because it's gonna take all your healers focus to keep an MT alive. We took him down no troubles with 12 guys using this method. Now just to get teh quest and do it again, hehe.