Unless the resistance is in the same class as AV's Souleater resistance, this will still be very much overpowered on VW mobs. A party of 18 BLM could take down any VW mob in seconds with ease. Just use Alacrity and ES, pop the NM, use a Fool's/Fanatic's and start a coordinated nuke. 4s casting will be increased to ~6s casting time, considering all people will start at slightly different times. Which means in about 20 seconds all three Meteors will be fired and what's left of the mob will have to be scraped from the floor.