Legal power is legal power, physics is physics.
A 250Wh mid drive bike with a typical 60NM will provide exactly the same level of assistance as a 250Wh hub drive bike with 60NM.
They all cut out at 15.5MPH, so the assertion that yours goes racing off from others with pretty much identical output does not, with respect, bear scrutiny.
Next you'll be telling us that you're one of these folk that goes around burning off roadies on your ebike. Feel free to meet with me at a convenient location and we'll see how it compares against all 19 stone of me on a hub drive machine.