Sketchy style showing hidden/smooth edges on curved faceted surfaces

is there a way to get Enscape not to show edges that are on curved surfaces in the sketchy mode? I have a context model with some faceted curved surfaces. The edges are not visible in the white mode, but start appearing in the sketchy style. Also it seems that when i am closer to the faceted surface the edges disappear, but when the object is in the distance they start showing. Is there a way to stop this happening? I would imagine the objects in distance should have less detail (no edges on curved surfaces) rather than the other way around?

white mode with outlines:

from distance - lot of edges on curved surfaces:

Closer up - some edges are lost, others remain:

is there a way to control this?