You can remove the bumperguard, cut off the sides and re-install. You can also remove the grip and replace it with two overgrips. Removing mass from the bumper will make the frame more HL and reduce the SW. Removing weight from the grip will make the frame more HH and still reduce SW.
Well, i am 13 and actually own a k tour but i played with a k 90 once and loved it! If i want to make my k tour from 10.6 to 11.3 and more head light, how much and where do i apply the grip tape?