There's not really anything to take advantage of in the fight. It's mostly about whether or not you can do good damage in between the constant esunas and cures. If you can't, you might want to do some leveling, although you're basically high enough to beat him. When I fought him, I found that keeping my guys spaced out helped a bunch. It takes a lot of constant tweaking but it worked. Also, anytime you're participating in a fight that requires a lot of downtime(esunas, cures, buffs, etc) I find it's best to have a fast weapon: a ninja sword, katana, or dagger at lower levels. Because you'll only have a couple seconds to get your hits in, you want to make sure you'll actually swing before you have to cure again. It also helps for taking out the clones quickly.