Meh, I use Phlegetons Cuirass. Its a good sub in for T9 chest, since if you are going for T9 chest setup, the similar stats makes you not accuracy overloaded till RNG decides to grace you. Its certainly better for a crit/det build then Noct body, if you can maintain the accuracy (get a Conqueror).

As far as BiS min/maxing, it should pull very slightly ahead of the T9 body for DPS. I wouldn't sweat it though. I'd take the safety net of VIT/armor mixed in with epeen of i110 over Phlegetons slightly better (probably not even 1-2% max?) dps increase. T9 body will also be better if you plan on using STR accessories (non crafted) for the right side.