Interesting as heck. Do you know if the 11/16” quoted is the distance around the circumference of the sphere (where the CB touches the cloth) to where the cue touches the CB, or measured from the cloth directly below the CB contact point?If you look at this study you can see that the pros hit all their draw shots with almost the same contact height on the cue ball. I think that by just hitting a ton of draw shots you will find this spot intuitively. The spot is 17.4 mm (11/16inch) from the cloth.
"A group of 20 top elite players (height: 180.2 ± 6.7 cm, mass: 80.3 ± 13.5 kg), all of them ranked under the top 80 of the Euro-tour of the European Pocket Billiard Federation, 5 of them former world champions"
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Movement Variability of Professional Pool Billiards Players on Selected TasksParameter values characterizing the motion of the cue during impact in pool billiards have been determined for selected shots. 20 elite players perfor…www.sciencedirect.com
I would assume it’s the latter.