yes that’s right all motors from china have a lot more power than any other. if you want to fly right at the top of the performance class, you can only win with china high tech! you have already shown it in many videos and xc logs.
the efficiency of the propeller at 3700 rpm on the m40c30 / kv 43 is less than 35%. there are almost no propellers that are designed for these speeds. are you sure that you actually do real tests?