Don't be "passive" but definitely be on guard. Attack when you have an opening and be wary of his speed. With these harder fights it's about being patient, getting in what damage you can without being greedy, and staying in the fight with guarding, dodging, and being on top of it with heals.
Last time I did it was months ago now. But from what I remember don't rely on items so much as just use cure then dodge as much as you can when mp is recharging. Probably ground combos are better... It took me a good few tries to do it so you're not alone. Its just been so long. I'm sorry I'm not sure how much a help I can be