Unwanted shadows

[si]

In many keyshot renders I'm finding that additional shadows are appearing which make objects appear creased or jagged on some faces. The attached picture shows an object that is a cylinder so shouldn't have any of the harsh shadows that seem to be appearing around the detail section. I'm currently having to go into photoshop on the final image to remove them.

I've also noticed close up that the edges of sometimes look blocky. Is this a problem with the object importing properly or can sharpness be increased?

[guest84672]

Looks like a tessellation issue. Can you increase the tessellation inside SE?