Regarding BLM aoe, here is one possible idea.

Add some synergy to Sharpcast + Flare, in order to double the potency of Flare, and remove the target based damage reduction.

Basically add the following secondary effect to Flare:
5% chance that potency and range will double and all targets hit will take full damage.

Hell make it a 1% chance! The idea would be that if as a BLM you "need" to demolish a pack RIGHT NOW, Sharpcast+Swiftcast+Flare = everything just died.
Mind you this means that you would need to plan ahead, and burn 2 60s CDs at once... But a 936 potency aoe with a 10y range is probably worth the investment.