Ok. For all the hours I have put into this game, I am late to the party. Everything I am messing with lately, you have found a problem with a game mechanic that applies. First the Drelkors range issue now this 
I am haivng zero problems with the Puncture proccing Shadow Daggers - in fact, its doing pretty well with rubbish gear in normal monoliths…
BUT.
I have stumbled on another of your “bug” reports. This time its the Aim Assist.
OMG I feel like I have had a stroke and need a medical evaluation - either that or my gaming hardware is broken. Its a nightmare using something like Puncture with its narrow targetting vs other bow skills that have a more general wider AoE effect. I aim at one mob and it hits another. It really feels like I am going bonkers.
Its destroying the playability of the build - the number of boss situations where some stupid irrelevant mob moves into aim assist range and takes my Puncture hits is crazy. It prevents me stacking the shadow daggers on a target of my choosing to the point where there is a VERY obvious decrease in damage. It ruins temporary attack speed buffs because you could otherwise stack multiple procs of shadow daggers on a single target but now its being “spread” across or “intercepted” by irrelevant mobs.
I honestly had never experienced this before in any of my other builds and never realised how bad it actually was.
Have asked on Discord to see if Mike and co have an update on the issue.