Job = RDM/SCH
Target = Fluffy Sheep
Elemental Skill = 408
INT = 90+84
Magic Attack Bonus = 28+104

Stone I - 336 Normal/350 Crit
Stone II - 742 Normal/774 Crit
Stone III - 1172 Normal/1222 Crit
Stone IV - 1837 Normal/1915 Crit

For T3+ I can still use my Fast Cast gear, but the delay between starting to cast & swapping has to be near instant because the cast time ends up being 1.2 seconds. T4s are a little more relaxed. T1~2 I see no reason to use any Fast Cast gear for pre-cast as you will likely lower your damage, and on RDM or BLM you have -50% Cast time in your nuking gear anyways if not more most likely so chances are, your casting in .25~1.5 seconds anyways.