Here is a thought. You mentioned that you had read a number of other books on this subject. Then that you had bought this book "***Weekend Crash Course". Finally you said you wanted to get "more in depth information" on this subject.
I have taken classes in the past and whenever they were a "cram course" or "crash course", the main purpose is not "in depth understanding". It was only to get the main or most important concepts to function in or with a subject or to just pass a test. A specific purpose was inherent to the design of the course.
A) Having read the other books on the same types of material made you familiar with the vocabulary of the subject beforehand. So it was unlikely you would find any other single words or perhaps concepts that would be unfamiliar.
B) Looking for in depth knowledge from a book designed to not really supply in depth knowledge but just a broad understanding of subject was in retrospect not such a good idea. Probably one of the best things about Photoreading is that it will help us to determine if a book is really worth the effort to read it or study it more intensely at all. In other words will it really help me get where I want to go. It sounds like this one won't help you there. So the fault is not so much with PR but with the choice of the reading material.
Also, the perusing you mentioned IS a part of the PR system. You just may have been using it naturally all along. Now the rest of the system will help you go to the next level in your ability to quickly assimilate information.
C) Your focus could be; if you want to go over this book again very briefly; to find out if the are any new concepts or techniques that would add to your knowledge of this subject or expertise in the field. Of course state it as succinctly as you can before getting into the book. See if that helps identify what you could benefit from in this book.
Also, when you begin activating the material if nothing jumps out, then this book didn't really add to you kowledge base at all. It only went over things you were already familiar with.
D) Finally, it also sounds like you already have a good understanding of the topic and now you need to use the information for some purpose and find out where you need to shore up your knowledge by some trial and error or develop work. It will verify what you already know and highlight or expose areas you may want to pursue more specifically.
Alex's comments about taking the example exams and Photoreading them and then going back over your library on the subject will help do just that. Then try taking the sample exams as if you were sitting for it for real. You'll probably find it very revealing.
