IMHO you don't need a plugboard for Kobos. You do need to EJECT, then reconnect for all to appear.
Title
(optional) subtitle
Series - Index
Author
If you HAVE a plugboard need, do set it for
the specific Device type (and yes, you may need to make copies if you have the need on different model families).
Your wildcard plugboard may be confusing the Kobo's native support
BTW Subtitle requires a custom column to support and the Kobo Utilities Plugin