Help with remaining cooldown percentage parameter

I'm trying to add a feature that executes right before an entity is attacked where if the entity being attacked has also attacked within a recent enough timeframe the next code should trigger. My only problem is when I use:
   [ [Get remaining cooldown percentage of [Get item [Event/Target Entity] is using] for [Event/Target Entity] ] > 0 ]
It either never runs no matter what whether the player/entity has attacked recently, or if I include 0 in the remaining cooldown percentage it always runs no matter what. Any help would be greatly appreciated.