I have a background in Solidworks, but your baked in 3D cam is tempting me to the light side of the Force.
When I am using the MMB to orbit the model the speed at which it orbits seems to be way too fast. When I double my mouse DPI the orbit goes at a much more manageable speed.
I have searched for this on Google and was unable to find anything informative. In fact, I seem to be the only one complaining about it. If this is the case then please disregard.