Jim, I think you are talking about AJetcman. He is a Caddy tech, but I have not heard much from him lately and I'm not sure if he was completely successful or not. Westers is the only one that I am aware of that can do it properly. There is a guy at the cadillacowners.com that just had it done and is pretty happy with the outcome. My understanding is Westers will talk to you and find out exactly what you are looking for and tune it to suit you. Apparently they asked him a lot of questions. I think this is one of those you get what you pay for things.
http://www.cadillacforums.com/forums/cadillac-deville-1985-2005-including-1985/200215-ranger-submariner-dts-z-swap-testing.html#post2247224