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To me "working distance" in macro is measured from the front edge of the macro lens, rather than from the film plane which is normally used for the distance settings on the lens' focus scale.
That is correct for you - but everyone else counts working distance as being from the 'film' plane to the subject. It's that distance that's used in all the formulae.
The distance set on the distance scale on the lens is indeed from subject to film plane, but I agree that "working distance" is the distance between the subject and the front of the lens - it's that which determines e.g. shading of the subject by the lens hood.
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Re: Canon 100mm macro and extention tubes