I learned of a setting that noticeably improved the Rift head tracking for me. It made it smoother and fixed a left rear view problem I had in the A6M5b.
The fix was to split the available CPU cores between Aces High and the OculusVR programs. I have a quad core and assigned two cores to each program. Originally both programs had all four cores assigned to each.
You can try this for yourself by:
1) Starting up Aces High with your Rift as you normally do.
2) Take your HMD off and run the Windows Task Manager while Aces High and the Rift are still running.
3) Under the "Processes" tab you should see the Aces High DX11 program and OculusVR.
4) Right click on each of these programs and you will see the "Set Afinity" option.
5) Click on the "Set Afinity" option and a window displaying the cores will appear.
6) Assign half of the cores to Aces High and half to OculusVR. The setting will take effect immediately.
7) Put your Rift back on and look around to see the improvement.
This is not a permanent setting. As soon as you close Aces High and the Rift programs it will revert back to using all the cores.
I did find a way to assign the cores to the Aces High program automatically by changing its short cut.
This Youtube explains how to do it:
https://www.youtube.com/watch?v=ht4bV8IuWcMI found that changing the assigned cores only to Aces High program still made tracking smoother and fixed the left rear view so that I could look around the headrest.
If you have head tracking problems or would like it to be smoother you might try this.
Hope this helps!