In your youtube vid https://youtu.be/64d0C4mAKAw?t=227, you mentioned that you can perform heavy attacks by pushing the mouse button harder.

Well I tried that by assigning a push force of 10% to the left mouse button and of course assign a heavy attack key to that.  With that setting, I had little success in performing heavy attacks; I'm still getting a string of mostly light attacks and very few heavies; in addition, if I want to perform an initial heavy attack by pushing hard on the left mouse button first, I cannot even do that.