I'd revamp the way NPCs react to your spells, like in the Destruction skill. They should be flailing around after set on fire, twitch when shocked, and slowed down more when frozen. They also don't even react to your Conjuration spells. Now, for a revamped skill... I'd say the Ward spell. It should be reflecting a certain percentage, not negating it. And besides, for some reason, all you need is the Lesser Ward since it can already block all damage from spells (even though it claims otherwise). The Telekinesis spell does need revamping too like you suggested.