When raising the throttle by a little bit, not all motors turn on. All of them turn on at higher throttle but not at the same speed. I redid ESC calibrations for each ESC manually and each one turns on even a low throttle. When I tip the drone at angle, some of the motors that were not spinning start spinning even at low throttle. I have redone compass and accelerometer calibrations several times now and even switched to a new Pixhawk (still the same issue). What could be the issue(s)?
You should set MOT_SPIN_ARM to a value where all props start turning slowly when the drone is armed.
After that, set MOT_SPIN_MIN ~3% higher than MOT_SPIN_ARM.
Perhaps no issue. Use Mission Planners Motor Test to run the motors and properly set the motor ranges. What you are doing is irrelevant.
Setting Motor Ranges
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That worked, thanks guys!