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Shifting at or near redline on a long straight nearly always make sense. Shifting through corners may benefit from leaving it in 1 higher gear depending on several factors. If exiting a corner in 2nd results in wheel spin, you are giving up all the torque advantage and adding 1 downshift and one upshift too many. A faster transition often results by staying in the higher gear (3rd) and focusing completely on maximizing a smooth racing line through the corner. I often run a corner both ways and compare the results later with a datalogger like Harry's.

As a rule I tend to keep the car between 4-6k in the corners and go to redline from 3rd and 4th on the straights. Minimum driver input usually wins the day.