I dislike your balance suggestion, because it also affects endgame and isn't contained to the twink levels, where they are, in your opinion, a problem.
Fox is absolute trash in normal endgame FFA, because every class has at least two stunns/roots with higher or same range as foxes dash + knockbacks, while Fox has ONE unstun with 15 (FIFTEEN) second cooldown.

I've played a bit in 22 and imho everything that can utilize the Lvl 20 Hammer Plat Pack most efficiently seems to be doing well.