Well, as Carroll Shelby put it, horsepower sells cars, torque wins races. When I have a CLEAR ROAD I shift at about 6500, the torque peak, from second to third and up to fourth, and in fourth I usually wind it up a little higher for fun and to minimize the drop into fifth. I short shift from first to second and let the engine pull.
The engine is so smooth at 6000 I want to leave it there all day.
Steve