FWIW here's that Sanchez clip I mentioned earlier.
https://www.youtube.com/watch?v=ZvbrunDhCX8
It's not the shot being discussed but it has rendered many a tester to mere duck; for me anyway.
On that positional shot, it's right in the flying a helicopter zone ie. as complex. I think the key to these routes is working the zones separately.
Speed and perfect rolling only.
Topspin only.
Corrective side
Side as propulsion only
The graininess doesn't end obviously, the zones interact and interfere. Fortunately pool sense usually prevails.