With act 2/3/4 being nerfed 3 times in a row, you shouldn't require that much effort in progressing (not farming).
Here's some issues with your build and gear set up.
1. Your weapon is completely outdated, try search in AH for a xbow instead of bow with atleast 1k+ dps and a open socket.
2. Do not attempt to use Vault-Trail of Cinders unless you have atleast 45+ max disc or so; your 30 max disc shall be used for either Shadow Power or Smoke Screen for survivability.
3. Preperation is mandatory unless you have the 4 pieces legacy Nataya set.
4. Elemental Arrow - Ball Lightning over laps with Multishot - Fire at will; you will only need one of those to dump hatred.
Your AR and max life is ok for later acts, try search on AH for more +crit and +crit dmg pieces, and you will be able to clear through A2,3,4 really fast.
1