My group sells Bismarck with WAR/DK tanking, SCH/WHM healing and MNK/BLM/BRD doing dps. It's easier when the DK switch to WAR as well because of the DPS, but we do it pretty safe like this without relying on luck or anything like that. It just sucks to sell to another tank because of the debuff, but other than that, all good.

For Ravana it's WAR tanking, SCH/WHM healing, MNK/BLM/BRD/BRD doing dps. We do it in like 8:30 or 9:00 minutes. Faster and easier than Bismarck.

DPS for my BRD in Ravana is around 660 (without foods or potions, no need) and Bismarck depends, but it's over 600.