Here are values for DoTs empowered by Cruel Flurry and not empowered.
The setup is a stamsorc, 5 x Relequen, 5 x Lokke, and either 2 x vMA DW or 2 x Velidreth.
Empowered with Cruel Flurry
Rending Slashes non-crit: 2006
Rending Slashes crit: 4032
Poison Injection non-crit: 1935
Poison Injection crit: 3890
Barbed Trap non-crit: 2006
Barbed Trap crit: 4032
Not Empowered
Rending Slashes non-crit: 1724
Rending Slashes crit: 3464
Poison Injection non-crit: 1663
Poison Injection crit: 3344
Barbed Trap non-crit: 1724
Barbed Trap crit: 3464
So this is a ~16.36% damage increase on single-target DoTs. If these three DoTs comprise a total of 20% of your DPS (which is *very* generous), vMA DW would provide a grand total of a 3.2% DPS increase ... which is not really worth running considering the damage + 1-piece stat you can get from a monster set. In practice, those three DoTs will probably be closer to 10-12% of your total DPS, which means you'd probably get just as much out of running Agility DW as you would Maelstrom.
And that's assuming you bother using Rending Slashes or Poison Injection, when a fair amount of testing indicates that they may not be worth using at all.
TL;DR: Buff vMA DW back to +2000 Weapon Damage (and give us the 1-piece stat bonus back!)
Edited by LiquidPony on October 8, 2019 8:56PM