I tried to experiment a bit with less popular build on M+.
Auto generated choice suggested me to use:
3x Last Surprise
2x Helchains
1x Swirling Sands:
Result:
https://www.askmrrobot.com/wow/simulator/report/890e59c7190c42fba141fa1d7028273f
Then i replaced it to something that i feel it could be stronger:
3x Festermight
3x Heart of Darkness
Result:
https://www.askmrrobot.com/wow/simulator/report/2a829fd9865e4eb7a562463d0879b309
3% of difference between both. What are the differences in the selection?