Sorry 2byts, but I don't understand what you mean.

Keyshot overides the vertex normals when using the rounded edge shader, leading to render artifacts.
The images I post above show that you can have rounder edge effect on .obj coming from Moi without artifacts. (using Modo).

So it's definitively a Keyshot problem, there is nothing wrong with MoI exporter, whatever the format you use.

(FBX is usefull to handle complex ngones, at least in 3dsmax)