@Tommy moon
I think I now fully understand your frustrations. If you take a look back through this thread, you will see several conversations about how GT7 does some really funky/crappy stuff with our wheel that (unfortunately) is completely out of Logitechs control.
If you take a look for Logi_Rich posts, you will see that GT7 will make several changes to the wheel settings based on how you configure the wheel... And some of these settings might not get changed until you close and restart the game. PD also decided that there is a "safety concern" regarding the FFB with our wheel, so they put a cap on the maximum FFB torque of around 7-8nm. It's total bs and still haven't found anything dangerous about using the full 11nm torque via a drivehub.
FFB filter is a good example of how GT7 is making weird changes to our wheel... I've found that when I'm using the full 11nm torque, I will need to set the FFB filter to 1 because of oscillation issues when set to 2 or higher.
Please continue to post in here and ask questions. You might get some odd or rude responses from a few individuals, but we are all here to learn and to help each other out. I know this thread has been a huge to help to me from several awesome members that have taken the time to answer my (stupid) questions lol.