OK so I've been testing the 2 new dps boons from Chult. Lingering Curse and Soul Syphon. I did 5 runs with each.
Lingering Curse avg's 95 procs and 970k over all dmg. max hit was 30 avg hit was 9333, It is effected by DR.
Soul Syphon avg's 512 procs and 758k over all dmg, Also it does not add the dmg of all the stacks together when the mob dies. 10 stacks is 10 separate hits of 2k each then add in DR. the heal portion had 138 swings with 18 hit, max heal was 15780, lowest 1551, avg 4800, does not seem ao be effected by buffs, my HP is at 150k.
If you don't need the extra heal then it's looking like Lingering Curse is the way to go for max dmg.
"The Sweet Ain't As Sweet Without The Sour!"