Personally, I have found that I can rapid read much more quikly after the photofocus step (with 24 hours of incubation).
Maybe try this: I rapid read using a soft gaze so that I am not staring at the line I am reading with tunnel vision. How do I do that? I just become aware of my peripheral vision and then read the words.
Also try getting into a relaxed state before you start reading. The conscious mind can be a sabateour of results. If you are relaxed then the internal critic will be silenced and you can get down to the business of comprehending the book.
Also if you are like me I hear the words read aloud in my head when I read. Try to limit this because that just slows down the process. Use your eyes for comprehension not an internal narrator.