Honestly, I would focus your efforts on getting the VO necklace. It shouldn't be too difficult if you are able to clear trials. It doesn't make sense to build around an obvious missing piece that is just not that hard to get. You are almost there.
In VMA, most of the top Stam players don't actually use VMA weapons for DW, but they do still use the VMA bow on the backbar to buff endless hail. Things die so fast in there that you really don't get the benefit of the VMA DW buff.
The standard go to in VMA is 5 VO (jewelry and 2 armor) a monster set (I think velidreth is better than kraghs) and 5 nightmothers (3 armor and 2 sharp daggers). Either a NM, VMA or Masters bow for the back bar.
For raw DPS outside of VMA, you will want VMA weapons, VO jewelry, a 5 piece (NM, TBS, etc.), and a monster set (kraghs is solid as is stormfist on a stam Sorc).