Hi. I went through your wiki on setting up your project to run in VR on android. https://docs.unrealengine.com/latest/INT/Platforms/GoogleVR/QuickStart/index.html
I also use Screen Position to drive different images into left and right eye from a single material.
Could you please try this with a simple VR project for mobile? If it works for you I will do my own stripped of big data and upload it here.