You should try to use low level destrucion spells instead of high level spells.
Since you can level smithing to 100 with just producing iron daggers, I assume it is the same to other skills.
Using low level spells kills the monster slower but increases the usage drastically. Give it a try ...
Um, that won't work. Most things will kill me in about 1 or 2 hits if I let them get too close. The only way this would work is if I could somehow paralyze the target, permanently.
Everything else dies so fast to even low level spells, that won't work, either.
I'm really at a loss, here.