Get some kind of non slip pad to put on the seat. I would suggest about 1" thick. Put it towards the rear of the seat which will effectively move you farther forward in the pocket. Ride the bike with the pad and see how your shoulders do. Trial and error and then find where you're most comfortable.
You will then be able to tell RDL what it needs.
I have had three RDL seats.
RDL seats are great. I have had three! They have earned the Bigdon Seal of Approval! Whatever that's worth.
ADV Relay Rider 08 (The Texas Connection)
Ride Pooie Ride
Don't stop riding until you get to the crash , you might save it!