I would consider if I was doing this Ex with 1 Tank and 1 Healer (It's been done) and with a comp like that, everybody's DPS would be higher anyways. No with 4 DPS, I am not taking the risk. Risking to lose your cast to respect mechanics is still a safer way to clear and should be done like that.
If people think the solution to fix broken mechanics on a job is to ignore mechanics. This is another argument not to bring you into progression and leave you behind with your BLM. You can get away with farm content but the question here is progression and in progression you were hitting those mobs. If you weren't, you were a danger to your group.
*should* is the keyword. In progression, there is no should. You respect mechanics period.