Ahh, that's the problem. Your purpose doesn't relate to the books you are using. For each book you've picked up you've had no purpose or need to get any information out of the book.
PhotoReading starts with having a purpose for the book. It's active reading you cannot expect great results if you are passively waiting for relevant information to come to you from the book.
Consider what your purpose is for each book. Learning PhotoReading is a by product of PhotoReading and activating on purpose.
Alex