I had this exact same problem when I first got set up. It turns out I was leaning in too far to read the text and clipping outside of the tracking frustum, which you can see in the configuration utility demo scene. Your head doesn't have to go right out. I guess it's just more inaccurate the further you go. I had my tracking gadget on top of my monitor a few inches higher than my head, about 2 feet away. I think they recommend 5 feet don't they. Anyway as I've got used to the game I just kind-of know what the text reads so my brain fills it out without my having to concentrate on it. So in that respect the problem just kind-of goes away.
I think when the Rift's resolution gets a bump the text will become more readable.