Black Mage Sanctuary - A Guide to DPS

[StouterTaru]

UI and AF only affects cast but not recast, making your recast actually higher than your cast time during the transitions; you can't even F1 immediately after F3 if you look closely.

You might not be able to cast F1 right at the end of F3 cast, but you can queue it up to cast right at the end of the GCD. F4 requires the animation to complete before it lets you think about starting a cast.