Does it proc “on-hit” on skills with weapon damage, or does it proc when a skill goes on cooldown? Something else? I’ve been testing with Amarasta’s Blade Burst against single dummies and groups of dummies, with one item and three items with the affix. I doesn’t feel like its proccing on hit, or it would for sure be proccing more often.
Seems to proc on use of any ability. Weapon hits seem to have no factor.
Yes, I remember it working like that
just like Bloodlord's Blade - Items - Grim Dawn Item Database
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Alot less effective than I thought, but for something like ABB could still be pretty effective. It at least means it’s just as effective single target as it is vs groups.
It becomes effective if you have 2+ items with it and some global cooldown% of course 
I’ve abused it some builds, but global cooldown% stacking is more effective of course.