Try DeoVR autofocus feature that puts things you are looking at into sweet spot getting a perfect alignments there.
It perfectly works for 180SBS. 360 might be added with upcoming updates
Enable auto focus inside Autofocus tab in Player Options. Planning to make it default with upcoming updates. It's still experimental and we are greatly improving it.
Install DeoVR from the app store on your headset or https://deovr.com/app