GOW 2018 - cooldown on perk activation?

Either there’s a cooldown on perk activations, or Luck is an absolute scam stat. I’m running nearly 300 luck, and using the Hraezla Farmadr Grip+, and it activates once in a blue moon, not once every axe hit.

Am I crazy or am I severely underestimating how much Luck is needed? The way it’s going it feels like I’d need a stat in the thousands to guarantee it.