XML Fetch + Reporting service on different server = SPN problem

Hi, 

I am having severe problems with Reporting Services and Fetch Reports. I have my CRM Server and SQL Server on different servers. 
Crm app pool is running under domain\svcaccount.  No duplicate spns, and spns registered for domain\svcaccount for: 

http/crmserver.domain.com 
http/crmserver
http/crm.domain.com
http/crm

All according to scenario 2 from http://blogs.msdn.com/b/crm/archive/2009/08/06/configuring-service-principal-names.aspx. 
(crm.domain.com is my dns name for the crm intsallation. CrmServer is my crm-server.). 

All non custom reports works fine, just the custom reports and XML fetch that does not work. 
They do work fine to run in visual studio. If I run them in reporting services I get:  

• An error has occurred during report processing. (rsProcessingAborted)
  • Query execution failed for dataset 'DataSet2'. (rsErrorExecutingCommand)
    • Microsoft.Crm.CrmException: An unexpected error occurred. System.ServiceModel.Security.SecurityNegotiationException: A call to SSPI failed, see inner exception. System.Security.Authentication.AuthenticationException: A call to SSPI failed, see inner exception. System.ComponentModel.Win32Exception: The target principal name is incorrect
      • An unexpected error occurred.
        • A call to SSPI failed, see inner exception.
          • A call to SSPI failed, see inner exception.
            • The target principal name is incorrect  

I know this is exactly the error you get when you are missing proper SPN's, but what else can I do but to make sure the crm service account is set up for delegation, search for duplicate spn:s by using scripts like "querySPN.vbs" (http://technet.microsoft.com/en-us/library/ee176972.aspx) and setting up the SPN's as described on whitepapers and blogs from Microsoft (liek the one I mentioned above)?

 Any ideas, or smart ways to dig in to more advanced troubleshooting? 

 Thanks, 

Ola