I do think that's the issue (spns) however the sql server for sure has spn's, and the ssrs server too.

It's the service account that sharepoint/ssrs is using that I think is the issue.

On the sharepoint server it shows itself as the ssrs server as well, however when I look, I see the SSRS Configuration Manager and it will open, however it doesn't actually let you do anything. Is this normal for SSRS integrated with sharepoint? I'm no stranger to SSRS, but I've never used it in integrated mode before.