youre not considering the big picture of gearing... +/- 25ft-lb on your dyno graph, is nothing compared to the huge gains of being in a lower gear. Simply downshifting can generate several hundreds of ft lb of torque at the wheels, depending on which 2 gears you are comparing.
Your dyno graph would have to fall down *significantly* to not still be putting more power to the wheels than upshifting, especially in the lower gear ratios
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