Thank you for your effort in providing this feedback.
I want to note few things at first. 1.Like Lazza has already guessed looks like you have stabilize horizon setting non default, but looks like you have this setting on 0 rather than max, so your camera is rigidly attached to the car with no damping at all, I don't know if thats what you must use for VR. I have had experience when VR got blurry because headset wasn't mounted properly, so IDK... . 2. 917K HDV file part of physics is majorly wrong, including springs stiffness, dampers, it is not much of a 917K in terms of what is in HDV file it shouldn't be so stiff, but this car should get more from bumps anyway as it is just super fast and it is from an era where cars begun to develop significant downforce, by the way 1'18 with Apex car, which has performance of late 70s F1 car, is a bit slow, so you should be getting even harder bumpness if you went faster

I have private modifications to 917K, it is still bumpy, and I can do 1'14. 3. I don't think modern GT cars is a good choice to judge Goodwood, it is obviously going to be more bumpy with such car, but it doesn't really fit goodwood anyway, and I did drive it and it wasn't so bad. 4. Most importantly, looks like you don't use the latest version of the mod, which among all changes has some bumps smoother or flattened. 5. There is no bumps volume control in here, the track is based on actual LiDAR data cloud mesh, which was smoothed like 300x and in some locations 100x more. I did paid good attention to the real track in order not to kill the bumps that I am sure that they belong to the track.
I would appreciate if someone would manage to point out bumps locations more precisely which they think that may not belong to the track. Then perhaps I would pay better attention to that and look if it should be improved. I am not going to rework the whole track just to make it smoother for a likes.
Interesting comparison for classic F1 cars. Apparently rF2 car has way more compliance, probably the car from real car does more bumps damping through the tires, and yes the camera might be stabilizing good deal of oscilations so also does the drivers body...
Because all of those things, when I am observing surface characteristics I rely more on exterior trackside cameras, in fact I also do that for vehicle behaviour observations in general, watching cars from outside gives better and more precise understanding.
I am not saying that the mod is perfect. There may be bumps that does not belong there. It is aerial LiDAR data, not high tech ground level scan after all. But in general I am enjoying the track, sorry if some doesn't. I won't repave it. But if you have some precise stuff to point out, other than "whole track is too bumpy", then it would be a bit more productive to discuss.