F1 22 G923 Rattling Heavily

Have you tried increasing the dampening in FFB settings? Normally, the feedback signal from the game, and what the wheel does as a reaction, need to be adjusted for most wheels. Since the G923 is a geared wheel, too sudden of adjustments in this signal can cause rattling just as you describe it. If you have a direct drive wheel, you can get a good experience without dampening. In short, dampening is trading sudden changes with smooth changes that make more sense for you to understand the car's behavior through the force feedback.

It exists a test tool that I haven't touched in a year, that I don't find right now, but I will look for it.

It is a test where you don't touch your wheel, and it starts to add incrementally more force in pulses, and reads the wheel's movement until you find the spot where the wheel actually moves from the force. It can be used to understand how much of details might be lost and how to set the damper, I'll see if I find some youtuber explaining it.

Anyways, try to tune your damper settings.