I’ve watched a lot of the 10 ball championship from Vegas and I particularly noticed two thing on closeups of FSR when down over the table. Once he’s determined his aim line and goes down in position he does not move his head up and back down before pulling the trigger. It’s all done with his eyes. They will shift back and forth from the cueball to the object ball but his head and body are totally fixed in place. That’s something I’ve never taken that into consideration all these years but it makes sense.