Observed downward fluctuations of more than ~30 us when writing a 1500 us pulse to 7 different pins.
Caused a lot of random spinning as I was using the signal for ESCs.

Used the Servo.h library as provided by this core.

const byte motor_pins[7] {2, 3, 5, 6, 9, 10, 11};Servo motors[7];void setup() {    for (int i = 0; i < NUM_MOTORS; i++) {        motors[i].attach(motor_pins[i]);        motors[i].writeMicroseconds(1500);    }}