It's never going to be brilliant on the G Pro (on console) but for the "bump steer"...
If you've got some added, drop the FFB effects slider in the game to zero. It's extra info that's not needed and can add to the roughness.
Lowering the gain in-game would also help - maybe increasing the power of the wheelbase to compensate. Setting the tone to suspension feel instead of tyre feel will lighten the steering - maybe around 35. Add even more dampener on the wheel - you do tend to loose details but it helps with preventing those spikes.
And use raw or informative. Immersive I find is very heavy with Logitech wheels.