Thanks for the input Evan. Sounds like yours is the same way. Instead of the airfoil having a constant taper to the aileron tailing edge the line goes slightly negative around the aileron attachment point. This gives both wing tips a very slight teardrop shape (or reflex) that is equal top and bottom. Kato apparently intended to have the wing tips shaped that way because if you follow the plan there is no way to avoid it. This condition is most pronounced at the wing tip and does not exist at the root. I’ve used washout on other aircraft but not on any of my pattern aircraft. Interesting idea.