We're finally starting to speak the same language
After a bit of more digging on the forum and some help from a friend I managed to find the problem: seems that I was suppose to manually Save the book the another folder/device after I convert it.
After a bit more work I got to this template working: {author}/{title}/{author} - ({series} {series_index:0>2s}) - {title} which is more on my liking.
Ofc your suggestions are more then welcome but I personally know no series being written by any other author except the one who started it (collaborations yes but no different author).
It's a good tip to use the name of the series first instead of author and I promise I'll take it in consideration (at least for the series that have more then one authors).
I have one more problem: after I save the book in another folder the name of the series gets screwed up like: (Monarchies of God, The 01) - Paul Kearney - Hawkwood's Voyage.
Is there something I can do so that "The" is put at the beginning of the name? Or maybe I should just delete it altogether?