How to create a tensile tight surface

 From:  nufu
Hi guys,

Thanks for all the pointers. New to nurbs (after avoiding them in 3dsmax for 10 years), so this way of building something was a bit of a head scratcher :)

Managed to get it working and shaped quite nicely, but as you can see in the attached file it has quite a few pinching parts.

I have tried adding more curves to the cage, but it doesn't seem to help. Can the surface be relaxed somehow?

Thanks again :)