remove 2008 DFS Namespace Server

I have 3 2003R2 DFS Namespace servers that replicate our DFS Structure.  I added a 2008 Domain controller and made it a dfs namespace server.  We have been experiecing extreme delays when dfs root from 2003r2 terminal server clients, especially when you right click a file and click properties (2-3 minutes).  We do not have any "Folder" replication currentl in place, only the dfs folder structure and links replicates between all of the dfs namespace servers.

I think I want to remove the 2008 server as a dfs namespace server (basically I do not want clients getting our dfs mappings from the 2008 server)  how do i stop the replication of the dfs structure on the 2008 server and remove it as a namespace server.

I read several articles that say you should force your namespace servers to use DNS by adding a registry entry. to hklm\system\currentcontrolset\services\dfs\DfsDnsConfig set to 1 (which I had done on my 2003r2 servers years back and all of my links in dfs are using IP addresses \\10.90.1.7\sharename$) is there something I need to do to the 2008 server to force it to use DNS especially since there are no 2008 wins servers?

Thank you in advance.