The Pepino Waco has an internal box structure and that should be "0", unfortunately you cannot gain access to that now. You can always check the relationship between the top and bottom wing. If the top wing checks +2 and the bottom checks "0" then shim the bottom wing and block the plane up so the top wing checks +2 and recheck the bottom wing and it should read whatever you shimmed it to. Mind you your struts may no longer fit correctly and may induce warp. My "N" struts are adjustable as well
Anthony