Hi!

I keep 1/10th of the books I have in Calibre in my Aura so it's not too chaotic.
Shelves:
TBR (To be read) from 1 list I have with reading list plugin
Re-Read: same
Holmestice 2010: same (a few books from a collection)
Five Stars: all my favorite books are always with me (~250)
these were created with Calibre
then in the Aura I created the "For Calibre" shelf: when I finish a book from the TBR shelf I move it there, to remind me to update calibre (many times I want to add tags to it, also I change unread to read and delete it from the tbr reading list) and when I've done that I delete it from the Aura.
I populate the various lists on the reading list plugin automatically by searches of tags on the #myshelves custom column that I created specifically for the shelves on the Aura, it's very intuitive.