My experience of CT on 2 different data centers.
Mandragora (Mana) - this method is established and always happens this way with no change
First Room: Alliance A and C each take a dragon while B takes all elemental.
Second Room: Alliance A and C each take a demon while B takes all imps.
Third Room: Each alliance take a succubus and an eye and fight on their own platform
Bone Dragon: Alliance B MT and DPS bone dragon at center - Alliance A and C focus on skeleton adds. 1 tank in A+C will take the 1st and 3rd skeleton while the other tank will take the 2nd skeleton.
Atomos: Only one way to do it really?
Thanatos: Tank at entrance, not in middle where the ghost pop. Tanks that are not tanking Thanatos will hold Succubus until its killed. Invisible buff team tank will voke it off previous tank when previous team loses the buff.
Allagan Bomb: Each team take their target, rotate clockwise only, kill adds.
King Behemoth: Alliance B MT and DPS KB - Alliance A - Bombs and left 2 towers - Alliance C - Giant and right 2 towers - Typically ranged DPS handle towers
Archeon: Alliance B MT
Balmung (Aether):
First Room: Free for all - chaos - do/call whatever
Second Room: Free for all - chaos - do/call whatever
Third Room: Free for all - chaos - do/call whatever
Bone Dragon: Free for all - chaos - do/call whatever, skeleton blowing up cause no one want to drag them to corners and bone dragon dies before last set of skeleton dies cause switching target is hard.
Atomos: Only one way to do it really?
Thanatos: Free for all - chaos - do/call whatever, but tank Thanatos in the middle so people trying to kill the ghost get bitch slapped by Thanatos's AOE too. An who want to hold Succubus, just let them chase the healers around.
Allagan Bomb: Each team take their own target, clockwise/counterclockwise who cares, mobs right next to each other? MEH. Adds? Who cares, healer heal through that shit.
King Behemoth: Free for all - chaos - do/call whatever - tanks on tower and picks their noses doing nothing but tower duty
Archeon: Free for all - chaos - do/call whatever