If shield oats isn't available, use sword oats. Damage is enmity, and every bit helps esp as a low level PLD.

Ninja dps is pretty damn overpowered comparatively to other dps class at early levels. They get their 20% damage buff at lvl 36, and a 360 potency skill at lvl 35; they'll very likely peel aggro off you if they don't hold back their dps on pulls (esp with a pre-40 PLD)