Where is the BLM nerf?

[Alhanelem]

I personally wouldn't mind a 20% reduction in BLM damage coupled with a 20% reduction in MP cost, that way they can still dish out just as much damage but it takes them longer to do it.

BLM isn't 20% more powerful, and nobody that isn't BLM/whm is limited by MP. This would be an INSANE and totally unnecessary nerf.

This is why everyday people aren't in charge of balance. The main problem was that BLMs could nuke heavily with no consequenses because of collusion. Now, they still gain some enmity, so they'll take hate sooner after the effect wears off. If people are conciously deciding to beat contents without BLM (particularly hamlet defense) then it's obviously not so overpowered that it can be used for everything.

Slightly on topic, is it just me or does Stone seem more powerful than Aero everytime it's used?

it is, but its because Aero has an additional DoT. Though the DoT doesn't seem like it's strong enough to make up for the power difference.