I am sure this has been pointed out about 20 times over by now (not going to bother reading thread based on the OP), but I had to just point it out.
9% crit chance on 10 enemies is even odds of - 0.9 crits out of 10. So 'barely 1 out of 10' is about exactly right no?
So my question is - if both math and spelling are quite so hard...maybe spending time on ice storm could be spent better on other areas?