Guys, here is a quick drawing showing the extended leading edge sheeting that I'm suggesting. What this does is to maintain a better shape past the more critical high curved and forward portion of the wing. It's still a D tube but you just extend the sheeting a bit further back and then cap strip the rear portion of the wing. Very little extra weight but perhaps a whole lotta better aerodynamics. Note that the cap strips and open covering are now back at the portion of the curve where it won't sag anywhere near as much as if the sheeting ended right at the spar.

And I hope I got the right airfoil this time....