I did a bit more digging today and was looking through the Config Mgr. It looks like our primary site had the latest SCCM client installed, however the secondary sites never had their packages updated with the latest SP2 client, so they were installing SP1 which was in their package folder. I've updated the sites this evening and am hoping this will fix the issue, I know SP2 is needed for USMT 4 to work, so if all my other items are in order - I'm hoping to report back with success!