The Runemage is the last one that may still need to be balanced, I am gathering more data on it. That said, something to keep in mind with the Runemage Super is that the receive very large bonuses right now for successfully casting spells without getting a “miss”, and even for experienced Runemages there is going to be some missing going on during actual combat. In addition to that, they only get credit if the spell actually hits an enemy target, and again missing the target does happen.
But don’t be surprised if it gets adjusted in the future as well.
Finally, as I just said in the post, the Warrior now gets a nice bonus for their Super from blocking attacks, so you are going to have to test it while getting hit by enemies to get a real sense of how long it takes to charge.