This is what worked for me.
Code:
################################################
# Create Kindle Collections Plugin tweaks
#
# Calibre column names to include in collections, text to prepend for sorting, and
# minimum number of books needed for a column before creating a collection
create_kindle_collections_usecolumns = {
"series": [ "_ ", 500 ],
"tags": [ "", 1 ]
}
# Collection names or patterns to ignore (e.g. [ "ignorethis", ".*Ignore.*" ]
create_kindle_collections_ignore = [ ]
####################################################
I didn't want to use the "series" bit, but for some reason, deleting that part messed up the tweak and I got an error message. In the end, I just upped the number of books to include in any given series to a large number like 500. Now my collections are made just from my Calibre tags. So far, it's working great! Thanks so much for this!