You're putting too much onto one character. They won't have the ap to do everything you'd want from magic. You need to focus on one or two schools at most or you'll end up too strained.
Focus on one school.
Run into enemies with 40 - 200% resistance to that school.
Sit on the side lines as you are utterly useless that fight
You need to spread yourself around when it comes to Elements. There is so much resistance on enemies that you to easily run out of viable moves if you only have 1 school. Especially with Spells having such long cooldowns as it is.
Better to do 80% damage all the time, than 100% damage 80% of the time and be useless 20% of the time.
