Right...so with the addition of two M2 nuts under the starboard strut and two M2 nuts under the port strut in addition to two M2 nuts above it, the incidence of both wings, with all the strut cross-bracing ("incidence") wires in place, stands at 0-0 at the roots and 0-0 at the struts.
Now if I can just manage to do the flying and landing wires without messing up the incidence again. I've accepted that I'm going to use non-scale clevises to make the adjustments.