Thank you for the responses.
I hadn't considered the idea of not thinking through the ideas I get from the book. I'd give it more thought, but then that would be thinking about the idea of not thinking, wouldn't it? Seriously, I'm skeptical that photoreading books without bothering to think about the content is the answer.
Too many purposes or too broad a purpose may be a culprit. I'll try with a laser-focused purpose and see what happens.
