Thank you for the quick response @NikitaTomilov.
I have changed Servo4 to Servo9 and shifted all the others:
Servo1: 34
Servo2: 33
Servo3: 36
Servo9:75
Servo10:76
Servo11:41
Servo12:75
Servo13:76
All others disabled (0)
I have also followed the instructions in this post, once I’m using Q_ENABLE = 1.
Now I get a nice PWM output, but I was forced to set Q_RC_SPEED=50. Any other value makes the problem return. SERVO_RATE seems to have no affect.
I am actually concerned about running the drone at such a low rate. I am currently running the controller at 400 Hz (SCHED_LOOP_RATE=400).