Another thing to keep in mind when looking at chassis dyno results, from an inertia dyno, especially when a fairly high stall converter is used...... the data on the sheet starts when the button is pushed, which is often prior the gas pedal hitting the floor.
In that scenario, the numbers on the sheet below stall speed are at less that wot.

This is how you can end up with these oddly shaped graphs.

It’s not the same type of test as if there were a load cell and the throttle could be opened, the load stabilized against the brake, then released....... so that all data on the “run” would be at wot....... and the bottom of the run would start at stall speed(which could easily be at a higher rpm than where the motor makes peak tq).