You're packing quite a bit of crit there. I don't recommend or even rely on a crit heal myself as a white mage. In most cases it'll just overheal or the tank is dangerously low if the crit cure I (or cure II for that matter) doesn't overheal.
You need to figure out where the fine line is where you can heal comfortably. The two stats you'd want are Determination and piety, but it's not carved in stone that you should go 100% det first and piety if there's nothing better or vica versa. I personally recommend going for a build where piety and determination are in a certain balance you feel comfortable with. Too much det you'll gimp your MP pool quite a bit. Too much piety and you'll gimp your healing output quite a bit. Moral of the story: A general "BiS" build for White Mage doesn't exist, in my opinion. It mainly depends on your style and bias that will create your "BiS". Are you the omnipotent healer that gives the scholar more chances to cast some DoTs? Or are you the more cautious healer who banks up MP for the "just in case"-situations? Or perhaps a balance between the two? Only you can decide on that.
