Outssider. I really cant answer your question. I din't know why. If I lay a straight edge on my wing it touches the surface all the way from R1 to R10. It was my assumption that r1 was the right size. This method of construction is quite tricky. Maybe all large planes are built with this same jig system but I could lay my ribs on the template seemingly in perfect position. Measure and eye it up to find something is screwy. Cut the ribs from the template, set them back in the same place and they fall right into alignment. The margin for error is definately ZERO.
Looking at your pic in my opinion, you are fine.Again, this plane is designed to do most of its flying at or below stall speeds. Heck even our flat winged foamies fly fine at those speeds. Not saying that at higher speeds you are going to encounter a problem.

As far as the leading edge goes, what I do is I take my small razor plane to knock the corners down. It eally cuts down on the amount of sanding I need to do. Then I go along with my 12" sanding bar and sand both sides to match the contour of the wing. This gets me close. Now all that's left is rounding it off. For this I take a piece of sandpaper roughly 2" wide x 12" long, wrap it around the LE and with the wing standing on its TE I work the sandpaper in an up and down motion . This really rounds it off nice. I try to do a good job but I cant say I am anal about getting it perfect. Especially on a plane like this that is designed for slow speed flight. I did the best I could to show you how I do it. It is a bit tricky keeping the wing balanced.

Edit: Outssider, I don't see a center line drawn on R1. Are you sure that R1 is level to your board. Also curious to know if you have that same flat spot when you flip your wing over.