> Anything below 60Hz in VR has a significantly increased chance of giving motion sickness due to latency.

I think there is a subtle difference between fps (avg) and latency. I would say that a 'stable' latency is always better than a high fps.

> Try Guitar Hero / Rock Band with various audio / video latency settings. 10ms is obviously impactful, anything higher borderlines on unplayable, and even 5ms has a subtle impact increasing missing notes.

Do you mean that you set an additional latency for both video and audio? Or you delay only the audio by 10ms?