We found that it was best to allow 1 player to just damage the boss while he had the Swelling CorruptionSwelling Corruption active on himself and then healers would simply dispel the debuff when it got to 4 or 5 stacks. This allowed us to remove the Swelling CorruptionSwelling Corruption from the boss in a fast manner and then all DPS players could switch back to the boss in order to continue the fight.