i'll do ya one better remove it from caster dps and then change how phoenix downs work because this would solve that issue i'd say making so that when you use a phoenix down it puts a status effect on you called "raise" or some such an once you die that effect expires an to prevent the use of spamming phoenix downs make it so that it can only be applied outside of combat etc. this will allow players to get another chance while not effecting healer disciplines.
