Don't change Black Mage too much

[Keichi]

You've got enough instants to keep running for fourty seconds straight without stopping your gcd already
It's only tight if you want to use instants for massive damage instead of movement

That is only the case at late game. Not early game. And scathe looks to be a skill, that is mostly for the early game. And, for train hunts, where the boss is practicly dead, before you are even able to cast one fire 1 spell.
It allows you to attack, while, the tanks are making the wall run.