AliiaDeoVR I started experiencing this as well on my PSVR2 just now (DeoVR 15.6.3755 and SteamVR 2.16.6). Everything is smooth when inside the SteamVR home lobby and other apps like Skybox, but everything in DeoVR vibrates or shakes whenever I move my head or look around. I've tried toggling 6DoF on/off, switching playback engine, switching to DirectShow, but nothing helps so far.
Changing different versions didn't help either (5/18 Public, 5/15 release-candidate, or 3/3 platform-test).