Great thread!!
I shift when it is safe. LOL
Try this: turn 8 at Willow Springs entering the corner at 120mph almost at redline in 4th gear. In theory I should up shift. No thanks. If I lift for the shift I'm spinning the car at 125mph 
I have used this for years in drag racing: shift 500-800 RPM over peak torque to do exactly what has been described above. Hit the sweet spot that keeps the car accelerating.
B
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