[350TSS]

I am sorry I think I disagree with your peak change points in the second graph above. If you hang onto the gear until 8.7, 8.5, 8.3, 8.0 and 8.0 you have lost the best acceleration available, i.e when the graph is rising at its steepest.

Increase in speed on the graph happens fastest when the graph is rising steeply. Therefore on your graph 2 above effectively the length of the line between gear changes is equivalent to elapsed time.

If you change gear at the highest point of the graph for each gear, when the next gear is engaged you continue your ride on that part of the graph that is still climbing steeply and you reach the next peak sooner, you are gaining speed faster.

Your seat of the pants feel - change at about 5750/6000/6250 is absolutely the best (fastest) way to make progress