I saw this issue mentioned on the forums 20 hours ago at Rework the Paladin Mushroom Sword Fling, albeit it was posted in the wrong section of the forums.
This item is only used to troll Colosseum players. Why would you need more knockback if you have 25000 knockback score? What kind of person would even use this piece of level 13 garbage, when its perk can only be utilized past level 30?
This item should receive a new perk, alongside having a proper knockback perk implemented on a different weapon in its place.
Two handed weapons could have knockback on each spell, or just on basic attacks. Anything to get rid of this terribly designed perk.
Why does a 1 handed sword need to have a perk related to the 2 handed sword class?