Blend help

 From:  Michael Gibson
5230.3 In reply to 5230.1 
Also the front part of your wing is not smooth, it's got a slight crease in it where the upper and lower pieces come together - that's going to make edge-based filleting more difficult because there will be a little gap that it will have to try to fill between fillet pieces there.

So getting that piece to be actually smooth in the front would most likely help.

- Michael