So it looks like your cannister takes at least 10" of vacuum before it starts to provide advance, which sounds like it would be more for a stock motor/less duration cam than a performance motor/more duration cam. Cool.
I have an HEI with Pertronix upgrade kit, and the cannister takes 4" of vacuum to start advance, and 11" for full advance for a 10 degree total advance, of which it is fully adjustable from 0-20 degrees. It seems to me that depending on the components that are installed (carb size relevant to engine requirements, cannister, duration of camshaft, etc.), as to what the outcome of a particular graph such as above would be.
This hobbie is cool, you can always learn something.