I'm not sure how it is on other classes since I've only leveled cnj and gld but Fluid Aura{instant cast} which knocks back the target and binds them comes in pretty handy when needing to escape ,re-group or cast sleep. Sleep(repose) takes a lot longer to cast and can be interrupted so its only really useful in dungeons when the group grabs more then they can handle or if you want to get a quest item and don't feel like fighting in solo. Can't you just macro your spell and order your chocobo to attack again in the same macro?