[Vic55]

The compression and rebound is clearly a driver as your psi is fine. Its just the way its set up. If your roads have alot of uneven parts and undulations this will just naturally occur with the F90. I have the same issue with my stock and even modded suspension (M550i springs). The key is in the spring and damper combo and its just not dialed like Porsche has it or cars with magnetorheological dampers (I have them on my AMG GTS and R8 and on prior Ferraris and Lambo). Those chassis dynamics just soak up the bumps. But we are in 4300 lb sedans and the car is still so brilliant. For me, I like the more taut suspension and will give up heavier compression for a tighter feel that could be more uncomfortable for some. But where I live, the roads are really well paved and flat even on hills and turns. I honestly dont think you can change much spring wise to fix it but instead become more acclimated to it.