I also have done all that and it suddenly didn't work this morning. the read list popped back in and when I tried to turn it off the add to read list button is still there.
How to Add or Remove Reading List on Bookmarks Bar in Google Chrome-side-panel.png
How to Add or Remove Reading List on Bookmarks Bar in Google Chrome-read-list-1.jpg
How to Add or Remove Reading List on Bookmarks Bar in Google Chrome-read-list.jpg