The displays on this headset are angled apart, which means that both eyes cannot see both edges of both displays. If the left eye can't see much over to the right (and correspondingly, the right eye can't see much over to the left), then this display will suffer from the "big nose" problem. It's like when you place your flattened hand perpendicular to your face between your eyes.
The number I'd like to see is what the 100% overlap FOV is. That is, what's the FOV where both eyes can see the same imagery?