Hmm… 
… Did you also try the Weighted Normal modifier?
Or if it’s purely an extrusion you can try the free Boundary Aligned Remesh add-on for an even triangular fill of your edge loop. Then extrude the result.
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Hmm… … Did you also try the Weighted Normal modifier?
Or if it’s purely an extrusion you can try the free Boundary Aligned Remesh add-on for an even triangular fill of your edge loop. Then extrude the result.