In addition to the damage stacking, i want to also point out two problems on the duration of the skill.
The effective duration (24.3s in my case) doesn't fit the tooltip duration (18.2s when you hover the mouse on the line), I'm in Ptod upscale if that matter.
(I don't have the rigth to post the image)
The 41s enfeebled effect is also supspicious, tooltip says 21s...
In addition to that the curse is considered a beneficial ability so ability power, high intelligence and turning wheel quickly put the initial 10s close to 20s and your resolve is not considered. So as you gain level this ability can be used less and less often.
Other than that the game is a more challenging and better than ever, great job !