It's been difficult to get the Instant Cast plugin to "play nice" with the ATB system. Of course, now that I've got more coding experience, I could look into fixing that as part of 0.3.7's first round.
Bluff should be a simple enough fix. I'll have a patch for that out soon. Green Boss doesn't see through Bluff, but he may randomly decide to use his Thunder attack anyway, though he prefers his other attacks.
EDIT: That should be the fix uploaded!