I'm having some problems with the shading on a curved surface on my model, in with the studio light with lines you can clearly see how the shading goes weird around the bend, I can't figure out how to fix it. Thanks in advance! :D 

First image is the flat shaded version, second is using the built in studio MatCap, third is UV

Edit: Picture of UV added

[![Model with wireframe][2]][2]


[![Model with studio MatCap shading][3]][3]

[![enter image description here][4]][4]



  [2]: https://i.sstatic.net/kzcDe.png
  [3]: https://i.sstatic.net/r9S4Y.png
  [4]: https://i.sstatic.net/qBh9A.png