I just figure the +30 Enmity counts toward the Enmity loss reduction that Enmity+ does with gear. I also don't know what was ever figured out with Aero's idea of having 100 Enmity in your standard gear to eliminate hate loss. This spell and Burtgang would put a PLD at 48, with another 52 in gear which I assume to be fairly easy a PLD could have capped Enmity without any way of losing it by my understanding.