Cookies only gives
bonus of higher ranks, not the higher ranks themselves. What that means it that we'll get +20 on Duelling rolls and nothing more.
We have Exception Duelling. The next rank up from that is Elite and the next one after that is Legendary.
Bad science. If it resists movement left, you will move right. It resists movement there as well, so you'll move left. It balances out, to the point where it doesn't restrict your movement at all. If you want something that resists any movement in any direction, regular mundane weighted armour does exactly that.
EDIT:
@PoptartProdigy, can you walk us through how combat goes? We have no idea how combat plays out and thus trying to work out what we should boost is basically just guessing.