May be two issues going on. Here is the out of control thread. This was and still happens at random times to me.
Other are having this sensitivity issue. Mine adjusts fine and in even increments. I do not and will not edit any program files to me this a good way to have a file corruption issue.
Good Luck and hope you get to enjoy the sim soon @ over 100 hours I have had a great time just flying around the world looking at stuff. Not saying I don’t have issues with things not working properly but making the best of it until the fixes.