You can't stop DPS'ing Ifrit if you have 15 different DoT's on him when he gets to 20%. Yes, everyone can immediately switch to nails but that doesn't stop the DoTs from ticking away. Plus the Tanks are hitting him while they Tank swap. Two SMN's caused many wipes for our party as well until we found out about his 10% Enrage. Two SMN's are also very bad for nails as the Dot's can cause multiple nails to blow up at the same time which can wipe the party.
