add balsa to the leading edge
Jonboy -
If you're asking on how to do this? - I'd sheet it with 1/16 back to the main spar, then use cap strips feathered back to the trailing edge. Or, cap the trailing edge and center section sheeting with 1/16 too.
It would add a lot of strength - and some weight, and is probably not worth doing at all. The wing looks ok to me as designed.
Bob