I use an X52 Pro and it’s fully supported by all versions of MSFS. To me it sounds like you have a calibration issue. Have you looked in the Joystick section of Windows to check the calibration? Mine dances around a bit as well, although nowhere near as bad as what you are seeing. I’ve had my X52 Pro for 10+ years and it’s not the most stable when it comes to the throttle and the trim wheel on the throttle…so much so I had to give up on the latter as I needed a deadzone covering 60-70% of the travel to avoid noise from it 
It works though, so check your calibration settings in Windows.