I had some time today and finally got this thread up-to-date. I do keep the spreadsheet up-to-date more than this thread.
Also added a tab where you can check the 6-month-rule (I assume that was your intention?):
Updated Spreadsheet
I don't have any nominated books from 2018 or earlier in the list but will try to add them as I go from now on.
I think I have the logic correct, please let me know if it looks wrong.