Make battle sprit apply to proc sets. It's need to happen.
Just because everyone can use something does not mean it's balanced. And the stats aren't that bad, plus the fact that it hits harder than most ults every 10seconds more than makes up for it anyway.
thing is, everyone can run proc sets, its not determined by class. In case of caluurion you sacrifice a lot for it (the other stats are crap) so you can say it is balanced because everyone has the same choices. not so with class imbalances.
also stuff like Vigor and Dawnbreaker are much more broken than any proc set...