airflamesred,

I think I know what you mean by pinching on a curved surface.  I just use a relax modifier, and/or an extra level of subd to smooth it out.  Relaxing the edges will give a smoother result without increasing polycount.

Here's how it looks after relaxing the edges a bit; there's may still be some very minor pinching, but after applying a shader, and in a final render setting, it would never be noticable.

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