Why are healers so afraid of moving? Ifrit gives you plenty time to get into position for Searing Wind, since it always does its final pulse with 5 seconds remaining on the debuff. Both healers do not have to move at the same time, either.

Then you avoid having DPS screw up because they didn't notice which healer is pulsing, don't have to do silly things like forbid melee DPS from coming along, and Rush becomes trivial since the debuffed healer is at the appropriate starting position for Rushes every time. Once you learn to glance at the debuff every now and then (which is really not difficult...) it makes the fight much easier for everyone, including the healers.