One downside to your ability, Karby, is that it takes away from the AF3+2 set ability, which enhances the duration of your party's buffs. By casting self-only (say Protect, Haste, Shell, Stoneskin, Phalanx, Spikes, Aquaveil) and then Aura-ing it, you might as well not even bother. Just as a note, it might end up making the set obsolete.