Confirm the custom template on the CentralAccount column meets the correct logic. For example, the default will take effect for manual changes only. If you do not include this logic, your template will always take effect:
If CStr($ImportSource$) <> "ADS" And (Not CBool(Connection.Variables.Get("FULLSYNC")) Or CStr($ImportSource$).StartsWith("EBS")) Then...etc.
A simple test would be to revert to the default to confirm the behaviour.