hi Han, here's a few tips for your barb:
To make you survive better -
0) change your ww rune to Blood Funnel.
1) Roll 15% life on shoulder. This is because you're using BKO + WW6 0 CDR build, COTA uptime will be very insignificant. Furthermore, more than 70% of your damage comes from Dust Devil itself. Besides, Blood Funnel heals 1% of your life when you crit, so it scales better with more HP pool.
2) Helm - roll 6% crit instead of WW. Reason being blood funnel too - you crit more, you heal more. If you absolutely want to roll ww on helm, you can roll away vit or socket for WW% depending how much vit the helm has compare to 23% life gem. But 6% CHC on helm is a must.
3) Amulet and ring - having socket in jewellery is mandatory, legendary gems for ww are generally pain enhancer, taeguk and bane of trap.
4) Roll 10% damage on both your BK weapons, attack speed on BK is nice but only when you have %dmg rolled on BK.
5) Bracer - you're using Blood Funnel as your ww rune, so physical bracer will be the best.
6) Drop call of the ancient entirely since you're running 0 cdr build, and go for overpower - killing spree. More crit, more heal, and more damage.
7) Try to get vit on chest and your bracer.
8) String of Ear is the best belt for 0 cdr WW6+BK build.
That's all I can think of for now.