From what I can remember from testing it back in the beginning....
The tolerence is set for you to the best amount based on part type and size. There are no settings that I know of, they should be standard.
I do have a question though....
In Gibbs, are you tightening up the FACET tolerence? This could be just a graphic thing!! Right click on the model and select properties. You will see a slider for the chord height. For an inch part set it to about .001 - .005 for a good smooth model.
If this is not the problem and the part is coming in faceted and not smooth, send it to tech support.
support@gibbscam.com
GG