Tax override not working

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Store in Ontario Canada.  We charge HST 13% on everything but Books (GST only 5%).

I added our tax account number

I created a manual collection (GST Only) and added a few of our books to it.(They are also in out "Books and Magazines" Collection(Auto))

I then created a Tax exemption for Canada for for the manual collection, put 5%  and saved it - all by the book per the instructions

I then "purchased" one of the books in that collection - at check out it applied the full 13% tax not the 5% tax.

Is this functionality broken? Did I do something wrong or is this function not available to the basic Shopify level?