The red rectangle in the center of the view is a 2D surface directly composited onto the HMD. The key bug was that I was positioning it behind the head before.
It appears that changing the HMD compositing quality may have been affecting the vertical axis direction the rendering rate. I'm not sure how this happened, but for the moment I disabled it to avoid the problem. Now, on to actually rendering a 2D GUI into that red square.
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