I hope you find something that works for you 
I’ve not had a look at my muscle mommy since the start of the season though, otherwise I may have had proper suggestions.
What carried me early on was slotting basic skill damage in everything and have the 40 fury on leap, and just try to get speed. I used brawling skills to berserk and I think I got the aspect that gives constant fury while berserk pretty early.
With enemies having double the HP though, it think there’s just a bit too much of a threshold to get over early for the barbarian. It may be quick when soloing, but having to make twice the effort can be debilitating on resources early on.
Outside of a few choice late game builds, the barbarian seems to have a pretty low ceiling, even if it does really well under that.
Maybe there will be something to help a bit in 1.1.1.
I suspect that’s a few weeks off though.