Hi Ralf,
I like your implementation of FluidSync which on my Reverb G2 works well (game fps locked at 45fps).
One question: Have you considered a 30fps FluidSync (i.e. 1/3 of native WMR headset refresh rate?). I think few games would benefit from this as the 30fps FluidSync could make it possible to have them run in Geometry3D (which is, in my opinion, a better option to Z3D).
I am aware that SteamVR + WMR is not able of that (yet?), though the OpenXR is able to reproject from 30fps quite nicely.
Happy to hear your comment on this topic.
Cheers,
Milan