I started SCH `cuz of it´s unique weather and helix spells. I don´t want more spells of BLM/WHM/RDM. I want more unique spells.

Weather T2 / Enfeebling:
Just another idea. Let´s say we cast Firestorm II on a mob his resistance against Ice spell DMG will be increased by 10% but the resistance against Water spell DMG gets a 10% decrease. With Stormsurge merits the mobs corresponding stat (STR in this case) will be decreased.

Helix T2:
This could work like a mix of Helix and the NIN elemental wheel. So when we cast Pyrohelix II on a mob it lowers the enemies resistance against Water spells as long as the Helix is on the mob.