Thanks for the reply, Thomas. I guess I wasn't clear in my original question.
What media type as a starting point are people using when creating a profile for this paper? All other papers I use have worked out wonderfully. No matter what I do my best profile for Silver Rag is not even close to being a good profile. My evaluation image, that has many torture tests, shows that the profile for the paper/printer/ink combination does a horrific job at many things, and a linear step wedge is only the beginning.