IMHO aktualy your build is a bit too offensive compared to your gear. With higher gear you will be able to get back but for now this you should pimp your defense a bit, not to much.
- switch Weapon Master to Nerves of Steel
- get a Shield with %block
- get Helm of Command with Socket
- switch Berserker Rune to 100% more DMG
- switch Whirlwind with Leap (what rune fits to your playstyle it take 300% more armor)
%block leads you to a huge survivability in akt 3. Around 30% block should be fine. A Socket in the Helm of Command should push your life to over 60k+.
If you dont want to swap your build, just try to push your block.