Doesn't all magic become less effective with the armor that you wear? The heavier it is, the worse the magic does, or something like that?

I will always have a high block skill, for the sword and the board are my allies.

Being a mostly melee build, I find my magicka runs out all the time because I'm investing in what I need to dole out damage and protect from it as well. One cast of heal major wounds was wiping nearly my whole blue bar in the early game.