Thanks for the info. My LS doesn't have any ARC besides me (and I usually need to CNJ for this fight) so I figured if we could kill the king early before he gets all his AOE would have made the fight a lot simpler for our setup.

The kill order we've been using is BLM > BRD > THF > RNG > MRD > WHM > KING > GLAD to try and get as much AOE onto the king as possible so its only one target to keep an eye on. Our success so far seems to be based on how quickly/safely we can the first four down, and lately enmity has been wonky making DDs kite the THF/RNG early on killing our damage output. Random pickups attacking the wrong target doesn't help either... It's rarely that bad though.