Checked the plane against the plans last night to find out that he had drilled the wing dowel holes 1/4 of a inch too low. I was able to redrill and fill the old holes. I had to also shape the fuse a bit so that the wing fit correctly. I'm guessing that being off a quarter of a inch in the front is a big deal and probably the cause. Unfortunately it snowed here the other day so it will be a while before I can test again.