No worries @Drago
Agree it is hard to explain and teach. I have worked with several drivers (especially those driving me :-)) by watching a set of end course, discussing adjustments, then drive again and watch again. I think its the best way.
As I think we all agree, the most important thing is to adjust to the skier in real time. Stay in rhythm with the skier.
But one thing you said I will challenge: I am not sure there is much difference in strategy to pull a skier at 28 or 39. I approach it exactly the same way. Yes, the timing may be different but that is all captured under "adjust to the skier in real time". Generally, we wait longer as the rope gets shorter, but the way I move the boat is the same.