Thinking about it further. Maybe the best approach would be to just reduce the number of abilities that can CC.
So for instance the lightning bolt could reduce a stat or have a knock back (like someone flying across the room from putting a form in a socket), but lighting water or lighting on wet target stuns. Hitting a wet target with hail could reduce a stat (the ice on the ground still can cause you to trip). Hitting someone with an earth spell might "unbalance" them making them easier to charge, etc...
Force players to come up with combinations to increase or augment the effect their skills have, so that cleverness and optimization is rewarded (so brute strength isn't the best tactic). And reduce the number of skills that CC - rather than just keeping the same amount of skills that CC and trying to build a system around that (which will always have the problem that there's too much cc).
