Hi niko, here's another shot of your last MoI model with just diffuse lighting only:



That crease that you're talking about is really pretty subtle.

That kind of thing is just a general problem when building surfaces in a kind of "patchwork" like manner like this.

One option is to use the Match command in Rhino to tune up surfaces built like this to have better continuity.

But if you're looking to make deformations in things and maintain super smoothness, you might want to look into a sub-d modeling toolset like TSplines instead of doing a NURBS patchwork.

- Michael