I find your rule set interesting Econ, but IMO I see a few flaws with it -

The duel could be over with one bad roll, which inherently increases the randomness.

It includes more values that have to be kept track of.

It does not take into account the usefulness of other traits that come into combat, such as speed, reflexes, awareness, or allow in game flexibility upon actions.

I'm not trying to toot my own horn, but my system prolongs the duel, decreasing randomness, has few values to keep track of (HP and Dice, which I may end up calling Prowess), and in smaller easier to manage numbers.

Mine has a set of internal traits that correspond to the in game traits, but in a way that reduces clutter, and increases the chance you may end up with a duel trait. In this way, each character is unique, but not quite left behind at every turn.