I would accept a shorter cool down but since it is a group cleanse the balance would be thrown off. The better solution is to make Fey Caress a single target ability since debuffs are designed around a healer with single target Esuna anyway. A group cleanse is great in theory until you realize it is practically useless in almost all content. Changing it to a single target ability with a slight heal on a short cool down makes the ability infinitely more useful in all game content without throwing off healer balance. Selene could almost be a functional replacement to using Esuna as a Role Skill.