You should have some in heavy armour instead of pickpocketing.
That's just the character I'm playing right now. I didn't mean to say that yours was bad.
Balance, using your way of playing, you're holding a shield in your left hand or a conjuration spell?
I found the battlemage build fairly obsolete in Skyrim because mages are so powerful and fun to be but I decided to make a battlemage build and this is a great guide to making one.