First, I may need permission to send the data to you, as it belongs to a client. He is monitoring this post, so Gary if you see this perhaps you will post one one those problem drawings.
Secondly I believe that if you try it yourself, by building a roadway with lanes away from median, and project 2% through the sloped median, and 2% on the roadways, the after you build the corridor, and the surface to go with it, that the median slope is not projected correctly to the center of the medians as they reduce towards the turn lanes, and the lanes away do not maintain 2% cross slope.