"Yep, I'm having the same issue. Below a certain throttle level one of my motors is very slow while the other three are fine. I also did a calibration of all at once.
I will try removing the flight controller from the equation to see if the issue is…"
"Simple comparison, IMHO: open source or closed source.
I'll take open source any day of the week. I have both and I can find no specs for anything to do with anything DJI touches."