I have been fiddling a bit and one thing strikes me. If you have 12 books in a series, you use the Series tag and a plugboard to send all 12 to your device. Then the 12 books are named nicely for you.
But I don't put hundreds of books in my device, it takes too long to find what you want. And I don't read all 12 books in a series without a break. So I send a few books at a time to my device. So I read book1 of the series. Three months later I want to read book2. In calibre, it's not so easy to see which is book2 or book3, etc.
So I'll stick to [seriesname seriesnumber] booktitle for the Title. Although it is a bit of a pain doing all the editing.
Maybe a macro to do it?