Can't proc Sniper's Mark with Mark on Hit and Lifetap

New to POE & have tried to search the forums but can't fix this issue in my build (https://pobb.in/ygBPu_VZ4SE1).

Even with no mana reserved, I can't proc Sniper's Mark using Mark on Hit, with or without Lifetap. Am running the ol' Tornado Shot Deadeye.

I've been following a build guide as close as I can, and it used to work in a previous build but don't know what has changed. I did just get a bunch of divines from a lukcy div card drop so perhaps my spending spree has created a conflict somewhere?

Any help appreciated, even a pointer to where to look for a potential solution would be great.

Thanks in advance.

It looks like you have a curse limit of 1, and might also overwrite it with a different mark anyways.

Your gloves have "Curse with Elemental Weakness on hit". With a curse limit of 1...I'm not sure which takes precedence for cursing, but even if they had Sniper's Mark after the first hit, the second hit would remove it to apply Elemental Weakness, while Sniper's Mark is still on cooldown.

Additionally, you also have Warlord's Mark on a "Cast on Crit" Manaforge setup. I don't actually know whether this setup works, since I don't do bow builds often, but if it does you'd frequently be replacing Sniper's Mark with Warlord's Mark, since you can only have one Mark active/one Marked enemy at a time.

TIL about curse limits. Thanks! That fixed it.

I was hoping to run those gloves (Shadows and Dust) with Sniper's Mark.