The elemental wheel, and spells need to be redone pure and simple.

Black Mage should get access to all spells with Aeroga and Stonega. Not thaumaturge though.

Wind blowing out fire is stupid. Water has always been fires opposing force. I believe this is a failed "Twilight" effect.

(Twilight effect-trying to make something new, but making something bad, and some how the minority that like it, somehow manage to keep it the same. Glittering vampires in sunlight instead of them exploding. It's dumbs.)

Fire Water
Lightning Earth
Ice Wind
Light Dark

This is how it should be done.