Really glad you solved the problem. I think I was one of those who may have suggested previously that you may have issues with the joystick.
To be honest I think many don’t understand why a good quality joystick is vital in this sim. Lower quality and older joysticks unfortunately can develop jitter. This is especially true if they are potentiometer based which is what most low to medium end joysticks are. Also older joystick may lose their linear progression, causing jumps or random movements.
That jitter when paired with higher sensitivities can cause all sorts of issues. Whilst there are software tricks to solve this, all software tricks effectively do the same thing as when you applur a blur filter to smoothen noise in a photo. Whilst it may reduce noise it can also remove detail.
When the noise and jitter is great, or if the linear response is faulty you cannot work with it anymore.
I actually purchased a thrust master t16000m flight pack prior to FS2020 release as I knew my existing Logitech force feedback pro joystick was already exhibiting problems (it is 15 years old)
The 16000m uses hall sensors which are less effected by noise and more sensitive than potentiometers, and have as such never experienced some of the issues others are experiencing with AP turning off and such. But I am sure after a few years it will start to develop issues.
Anyway hope you are now enjoying flying again!