Cross-site XSN access - still referring to netbiosname instead of FQDN

I'm really at a loss here. I do not want to use the netbios name at all, I have the FQDN and want to use only that. But for some reason InfoPath insists on referring to the netbios name whenever it tries to access the form from Outlook - a la 'Open This Task'. I want to remove any references to the netbios name and I think it is configuration, but I've had MS take a look at the AAM and they say it is fine.

Event code: 3005 
Event message: An unhandled exception has occurred. 
Event time: 2/19/2015 5:20:11 PM 
Event time (UTC): 2/19/2015 11:20:11 PM 
Event ID: ec6a4f67fbc74a4e8e9939a0fa6eed78 
Event sequence: 18025 
Event occurrence: 20 
Event detail code: 0 

Application information: 
    Application domain: /LM/W3SVC/570468131/ROOT-1-130688085051479202 
    Trust level: Full 
    Application Virtual Path: / 
    Application Path: C:\inetpub\wwwroot\wss\VirtualDirectories\80\ 
    Machine name: EMSCORPSP01 

Process information: 
    Process ID: 7576 
    Process name: w3wp.exe 
    Account name: ABC-CORP\tehadmin 

Exception information: 
    Exception type: InfoPathLocalizedException 
    Exception message: The following location is in a different site collection: https://NETBIOSNAME/_catalogs/wfpub/Approval[%]20-[%]20Sharepoint[%]202010/ReviewApproval_Task_1033.xsn. Access to locations on different site collections is blocked for security reasons. For more information, contact your site administrator.
   at Microsoft.Office.InfoPath.Server.Controls.ResourcePage.CheckSameSiteCollection(Uri absoluteXsnUri, SPSite currentSite)
   at Microsoft.Office.InfoPath.Server.Controls.ResourcePage.HandleTemplateFile(HttpContext context)
   at Microsoft.Office.InfoPath.Server.Controls.ResourcePage.<>c__DisplayClass2.<ProcessRequestInternal>b__0()
   at Microsoft.Office.Server.Diagnostics.FirstChanceHandler.ExceptionFilter(Boolean fRethrowException, TryBlock tryBlock, FilterBlock filter, CatchBlock catchBlock, FinallyBlock finallyBlock)
   at Microsoft.Office.InfoPath.Server.Controls.ResourcePage.ProcessRequestInternal(HttpContext context)
   at Microsoft.Office.InfoPath.Server.Controls.ProcessRequestPageBase.ProcessRequest(HttpContext context)
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)



Request information: 
    Request URL: http://ift.tt/1vktL16 - Sharepoint 2010/ReviewApproval_Task_1033.xsn 
    Request path: /_layouts/15/formResource.aspx 
    User host address: fe80::552a:7785:2b3f:d9e4EMSCORPSP01 
    User: 0#.w|abc-corp\that.guy 
    Is authenticated: True 
    Authentication Type: Federation 
    Thread account name: ABC-CORP\tehadmin 

Thread information: 
    Thread ID: 11 
    Thread account name: ABC-CORP\tehadmin 
    Is impersonating: True 
    Stack trace:    at Microsoft.Office.InfoPath.Server.Controls.ResourcePage.CheckSameSiteCollection(Uri absoluteXsnUri, SPSite currentSite)
   at Microsoft.Office.InfoPath.Server.Controls.ResourcePage.HandleTemplateFile(HttpContext context)
   at Microsoft.Office.InfoPath.Server.Controls.ResourcePage.<>c__DisplayClass2.<ProcessRequestInternal>b__0()
   at Microsoft.Office.Server.Diagnostics.FirstChanceHandler.ExceptionFilter(Boolean fRethrowException, TryBlock tryBlock, FilterBlock filter, CatchBlock catchBlock, FinallyBlock finallyBlock)
   at Microsoft.Office.InfoPath.Server.Controls.ResourcePage.ProcessRequestInternal(HttpContext context)
   at Microsoft.Office.InfoPath.Server.Controls.ProcessRequestPageBase.ProcessRequest(HttpContext context)
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)


Custom event details: 

Are there any folks that go to this StackExchange? I could really use the help.