Interesting process. Mine is opposite. Wash with P21 body shampoo and dry - ten minutes in low humidity Santa Fe, P21S Paint work cleanser - 15 minutes, P21S carnauba wax - 30 minutes,
Sonus Carnauba Spritz - 5 minutes. All done (of course if it is winter and I'm just looking for an excuse to be with the CS then those times expand with the amount of red wine I bring to the garage..). Living in a dusty environment makes me not invest several hours in detailing when it will be dirty before I even hit the gate to get on the pavement.
But everyone develops their on process and one sure isn't better than the other but I'd never ever put a buffer on the Cayman. Too many curves and edges. I use my Porter C. on other cars and trucks all the time by the way.