This zoom level in the photos makes it very hard to see whether or not the text is really blurry. Use Num* and Num/ to zoom in/out and get a closer shot.
When you say that's the furthest you can zoom with TrackIR, is that because your head is hitting the monitor, or because your clip is out of the camera's field of view?
If the former, you can increase the sensitivity on the Z axis scale in your TrackIR profile so that you're getting more zoom for the same head motion forward. If the latter, reposition your camera so it can better catch your clip.