RE: Balsa USA Super Cub Build
RD
Refer to page 24, para. 12 & 13 in your manual. It describes setting up your wing/struts. Since the wing "saddle" is level and you are using the same measurement of +3/4 " at rib W3 fore and aft to get the correct dihedral then your wing will be flat with out washout.
Hope this helps.
rv9-a