I just wanted to say that if you're in a nuking role, and you're worried about enmity, why wouldn't you just stop casting...?

Waiting for enmity to go down either from letting others get more or by using reduction abilities is a lot better than peppering with weak spells as waiting also allows you to recover MP and prevents you from continuing to accumulate enmity. Higher tier spells in FF11 were always a lot more MP efficient per damage dealt, too, so the scaling abilities will ensure that you're always casting at that high tier potency.