I rarely use my COR in Abyssea to be perfectly honest
Of course this is a problem with the job. We talk about all these ideal setups and none of us get to play the job anyway. I go BLU or WHM to most of my LS Aby events. So on the rare occ I've been allowed to come COR it's been a less than fruitful endeavor, mostly casting buffs and waiting on procs.
Still looking forward to completing Armaggeddon though.