My group actually goes a different route through Coil, avoiding the slashing resist. Our DPS for T2 is 2BRD 2BLM, so we take the Blunt and Piercing route (West Route). BRD dps takes quite the hit, but the blms more than make up the difference. Not having slashing resistance also makes threat easier on that fight.

Not sure what to tell you, but I rarely see threat issues beyond the first couple of seconds of an encounter. One of the BLMs likes to pull hate off the soldiers right at start of wave2 during Turn 4, but otherwise only issue is when dps pop CDs on first GCD.