Originally Posted by Torikakae
I believe that it has something to do with the monster moving too. When a monster is moving, it seems to be immune to attacks (it will either Miss or Block). Normally, when a monster moves, you won't be attacking it as your character would move to where the monster goes as well. But with Chi Sword, you can attack without moving from where you stand.
I verified this when a monster was under "Guard Break" but still blocked my melee attacks when it moved.
And unless you're willing to cast LK Breaker on every monster you see, that's probably the best you can get.
Unverified: Keep your Bull's Eye up. I've noticed a lot less blocking when I have that buff on. I don't know if it's the buff itself, or the total AC, or just a placebo though~