One thing that's absolutely killing me though is magicka regen. I am currently level 10, have used all but 2 of my levels on Magicka (used the other 2 for hit points), have Necromancer Robes (+75% magicka regen) as well as all the Magicka cost reducing perks for my level, but I still can't get off more than 3-4 Double Charged Firebolts before I'm dry. Any fight involving more than 1 mob is going to be a brutally long kite-fest.
Is there something I'm missing here? Thanks.