just assign a melee to the legs and leave the rest of the raid to nuke the body. The legs die so fast when melee is on them, 1-2 is fine. We have our Warrior just nuke them each time as it is a waste of time using casters as they need to move to the leg to gain the buff. There on a set respawn rate anyway so u can time when they will be up.
The main thing is the pheremones, if u can master the kiting around the edge and switching at the right time the fight is won.