First of all I know that most of the player sugegstion rarely gets implemented, but at least I write it and maybe some feedback would help the idea:)
In my point of view Mystics should be a supportive char, not a tank, heavy dps, healer at once. (Yes, I do have a mystic and tell the truth the class is rly OP).
So the suggestion would be to make the mystic as earlier told a supportive char which means Totem-master.
There would only need some switch of skills between saker and mystic, and would be more balanced.
The changes would look like the following:
Mystic would loose Fire rain, and Hellfire, the 2x AOE what makes rly insane dmg (not to mention with active debuffs).
Forsaker would loose Chaos totem and Fire totem, 1X supportive/pvp skill and an AOE.
The lost skills would be available for the other class, so the Saker gets the Fire rain and Hellfire.
Mytic would become a Totem-master getting the Fire and Chaos totem.
PRO: its way easier to program this changes than creating new skills.
Hope I get some positive feedbacks.