I by no means wish to pull rank here..
BUT.. As a former Fashion Designer, I have been called upon to judge many beauty contests of various particular features, none so varied as the length and shape, of appendages, fingers, for a Jewelery and Gem Industry..
Soooooo, I would place my emphasis on the inner ankle point, to the peak of the inner "Y", point! WHY? We have to measure apples and peaches differently..
My FRiend...you have quite a varied resume....you lucky dawg..