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I must be the first engineer to post in this thread. Here's what you are missing:
Horsepower is torque multiplied by rpm (times some constant to get to the power units of choice). If you shift at max torque or bracketing max torque you are shifting too soon. Two ways to see this:
Using Math, ex:
torque = 300 and is relatively flat
shift at 6000 rpm
c = .0001 to get to giraffe power
300 x 6000 x .0001 = 180 gp
torque = 300 and is relatively flat
shift at 7000 rpm
c = .0001 to get to giraffe power
300 x 7000 x .0001 = 210 gp
Using gut feel:
the same torque in a lower gear puts more power to the road so stay in the lower gear as long as possible.
This agrees with the factory shift points.
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