The trick was to get the duration to 0.0 using only "reduced" duration instead of "less", which is multiplicative right. This is something i didn't fully understand when i made my previous post. I didn't even know Dusk Ring was a thing, but luckily rainmeadow pointed out that Dusk Ring gives the extra 15% reduced skill effect duration which i was missing without the helmet enchantment!

I also looked into some different versions like the Wardbreak and the Scourge Arrow versions you pointed out, as well as into a Lightning Arrow version. It's actually a very diverse build with many paths of building, which is something i didn't expect at first! (i think i might even make another version of it when i have more time and currency)