I did some matches in my mig-29 and yesterday with the A-5C. Both had the same issue, starting near mach.
The cockpit is shaking like crazy and its really uncomfortable to be like this for a long time in VR.
I get it, there are turbulence near the mach barrier, yes they do disappear after mach 1.02 BUT they start reappearing after you go sub sonic again, at speeds not even close to mach.
Is there an option for this? Could this be my setting? Anyone else has this problem?