Although I didnt read the history of the cho-ku-no, I think you have the precision backwards. I dont think the poor accuracy should be due to the user, but the weapon. You have the marksman as a 3 precision and the weapon as a 0 offset from user skill. I think you meant to use normal or near normal precision of the man, maybe 9-11 (versus 3), and have the weapon at a -3 or less rating on the repeating xbow, down from 0.
But then again the images of them are a little smaller than the other types of recruits so maybe they are peasant boys/girls or something.
