If you're having difficulty turning pages, simply slow down and maintain a rhythm.
As long as you maintain the "soft gaze" and a steady rhythm, you'll imprint all the patterns of text into your "inner mind" at a page per second.
I've noticed personally, when PhotoReading something with high emotional content, a chapter or two can become difficult to turn the pages. This happened to me the last time I PhotoRed my bible. The pages in both books of Proverbs were very difficult to turn. Then, all the sudden, the pages became alot easier to turn.