Edit:  To correct the shape, and have it being planar (flat) on the bottom and curved onthe top, I simply added two more edge loops to control the shape a bit more, and here's the result.  Still all quads, no poles.

This is just a very quick job, but I'm sure it's in the right direction, because the shape of the wing could be moved into any variety of curvature at this point.

Is there anything inherantly wrong with this method?  Seems to take care of the issues you were having.

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