So we just got our ST a few weeks ago. It is a used 2020. I have noticed that under large bumps at higher speeds that the rear end chatters and feels like it looses traction. It's almost like the shocks are blown or really underdamped. It got a Ford CPO check right before I got it, so I'm unsure if that is the issue. I do not have the ST pack on it, so I am unsure that I have the ST sports suspension. Has anyone else experienced this issue?