So, my coil group has gone from being unable to clear Turn 4, to regularly beating it. We made several changes to our strategy in order to do this, but one big one was having the healers assist more on DPS. Our group has 3 physical DPS and a single BLM, so while the knights go down easily enough, the soldiers notsomuch. So we have the healers assist by, once their tank is good for the next few seconds, popping Cleric's Stance and laying down some DoTs. We now have no problem clearing each wave in time for the next.
One could perhaps argue that killing things is the job of the DPS, and if there's trouble killing them it's solely up to them to improve. However, the way I see it, every role can help the others. The tank and DPS can help the healers by taking their own steps to mitigate damage via cooldowns and avoiding AoE. The DPS and healers can help the tank by making use of abilities like Shroud of Saints and Quelling Strikes, as well as not going AoE spam heavy where it's not needed. And the tank and healers can help the DPS by doing their part to damage the monster as well.
