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if you look at the

    // supported values: 25, 50, 100, 200, 400, 800, 1600, 3200 (Hz)
    int getGyroRate();
    void setGyroRate(int rate);

    // supported values: 12.5, 25, 50, 100, 200, 400, 800, 1600 (Hz)
    float getAccelerometerRate();
    void setAccelerometerRate(float rate);

https://github.com/arduino/ArduinoCore-arc32/blob/master/libraries/CurieIMU/src/CurieIMU.h

you main loop is may to slow. if you set the rate to 25 is it then 25? or still 40?

is it possible to get you fool loop may isee something

the questen how fast the nh.spinOnce();

is executed

greet Anton