So first I thought the target actor might not actually be getting hit. I used console commands to set the actor's DestructionPowerMod value to base + 10k and got it to attack me with destruction spells. Still no damage. I set my DestructionPowerMod value the same way and it worked (I 1 shot everything).
So then I thought that her destruction spells weren't actually destruction spells. I went to the mage's college, change J'zargo's DestructionPowerMod value to base + 10k and attacked him. Same thing - no more damage than normal.
I also checked (just in case) that left handed spells were also in the destruction tree.
Does anyone know why changing the DestructionPowerMod value makes MY spells hit harder, but not any NPCs?
Thanks in advance.