>Looking at the profile curve of the wing, there is indeed probably a discontinuity in this area, the 3 points (red lines) should fit on one line.

Very nice trick PAQ, moving the offending point in line with its neighbours.

I was just about to post a filleting question, but now I don't need to :)

@Pac you say I draw a line (for align the 3 points)
but you can also use the "helpers" lines for draw this line ;)