Hi @trylle, many thanks for your detailed post and sorry to hear about the issues you have been facing. Indeed we are aware of some of the limitations with the head tracking and Z position stream within the Stream Engine API.
To that end, we are in the process of improving our products but we cannot at that time guarantee a release date for future firmware or SDK updates.
In terms of mitigating the output, you might try interpolating the data to smooth out results as a minor workaround.
Regarding multi-monitor support within the SDK, I am afraid this is not currently implemented but I will pass along your suggestion to the developers for discussion for a future release.
Our apologies for the inconvenience, we hope to be able to overcome these issues in the near future.