Hi Michael.
That's interesting. ViaCAD won't let me do a radius larger than 2.4 - it throws an error if I try 2.5. As for the surface quality, I must say it does seem OK within ViaCAD Pro. I've included a couple of screen shots of the shape with the Surface Analysis -> Environment Map applied to it. Do you think what you're seeing is something to do with exporting it as a SAT file?

Martin.