Public folder sync issues

We have Exchange 2013 and are using public folders, migration was completed from Exchange 2010 a few months ago and has been working as a single box successfully since. I am having an issue getting them to sync to the secondary mailbox. Below is the output from a few commands I have run. Everything looks OK to me but I am missing something.

For a reference the Hierarchy appears to be working because I have set one test client to use the "RRV Public folders" database and the folder structure shows up without any delays. I databases are located across 2 sites that are connected through a slow VSAT connection. I have given them 3 days to sync up and the primary box is 20GB and the secondary is 12kb, I assume this is the hierarchy information.

Name                                             IsExcludedFromServingHierarchy                       IsHierarchyReady
----                                             ------------------------------                       ----------------
Public Folders                                                            False                                   True
RRV Public Folders                                                        False                                   True

Update-PublicFolderMailbox -Identity RRVpublicfolders -InvokeSynchronizer -FullSync

RunspaceId                                                  Message
----------                                                  -------
44b3cbe6-4d24-400a-ad66-cc9d4929ad72                        Synchronizing folder hierarchy of mailbox "rrvpublicfold...
44b3cbe6-4d24-400a-ad66-cc9d4929ad72                        Sync in progress - job state is: "Queued".
44b3cbe6-4d24-400a-ad66-cc9d4929ad72                        Sync in progress - job state is: "Queued".
44b3cbe6-4d24-400a-ad66-cc9d4929ad72                        Sync in progress - job state is: "Queued".
44b3cbe6-4d24-400a-ad66-cc9d4929ad72                        Sync in progress - job state is: "Queued".
44b3cbe6-4d24-400a-ad66-cc9d4929ad72                        Sync in progress - job state is: "Queued".
44b3cbe6-4d24-400a-ad66-cc9d4929ad72                        Sync in progress - job state is: "Queued".
44b3cbe6-4d24-400a-ad66-cc9d4929ad72                        Sync in progress - job state is: "Queued".
44b3cbe6-4d24-400a-ad66-cc9d4929ad72                        Sync in progress - job state is: "Queued".
44b3cbe6-4d24-400a-ad66-cc9d4929ad72                        Sync in progress - job state is: "Queued".
44b3cbe6-4d24-400a-ad66-cc9d4929ad72                        Sync in progress - job state is: "Queued".
44b3cbe6-4d24-400a-ad66-cc9d4929ad72                        Sync in progress - job state is: "Queued".
44b3cbe6-4d24-400a-ad66-cc9d4929ad72                        Sync in progress - job state is: "Queued".
44b3cbe6-4d24-400a-ad66-cc9d4929ad72                        Sync in progress - job state is: "Queued".
44b3cbe6-4d24-400a-ad66-cc9d4929ad72                        Sync in progress - job state is: "Queued".
44b3cbe6-4d24-400a-ad66-cc9d4929ad72                        Sync in progress - job state is: "Queued".
44b3cbe6-4d24-400a-ad66-cc9d4929ad72                        Sync in progress - job state is: "Queued".
44b3cbe6-4d24-400a-ad66-cc9d4929ad72                        Sync in progress - job state is: "Queued".
44b3cbe6-4d24-400a-ad66-cc9d4929ad72                        Sync in progress - job state is: "Queued".
44b3cbe6-4d24-400a-ad66-cc9d4929ad72                        Sync in progress - job state is: "Queued".
44b3cbe6-4d24-400a-ad66-cc9d4929ad72                        Sync in progress - job state is: "Queued".
44b3cbe6-4d24-400a-ad66-cc9d4929ad72                        Synchronization is taking time to complete, so letting i...