the 3s part of the template accounts for the '010' (as desired)
the '10' is what I would expect if no template formatting ({series_index}) were used.
3.5 places can have template control
1a) Preferences: Send to Device
1b) preferences: Save to Disk
2) the
specific device OUTPUT driver. Preferences: Plugins: Device Interface: <your device>
3) Metadata plugboard
I know that #2 take priority over #1. I don't know where/how #3 fits in