I had a chance to talk with Pete about this at the recent Advanced Photoreading Retreat. The main point that he made was that the formal "activation" steps are relatively new to the process. He said that when they started Photoreading there wasn't anything but the photoreading step. He would take stacks of say 10 books and photoread them each day. Doing this for days, weeks, and months at a time he began to notice lots of interesting effects in his dreams, spontaneous activations, such as his story about the 3-D physics diagrams if you have heard about that one.
The thing is to take a very curious experimenting attitude towards the process - play with it. I have been photoreading regularly for about half a year - not 10 books a day, but occasionally I will do some large batches of PRing, and I am beginning to notice my regular reading pace effortlessly expanding to phenomenal levels. It kind of crept up on me. One week I noticed that I had read about 5 books and I thought back over the last month and saw that I had read about 20 books. Now this had really increased my excitement about the PR process and I am photoreading all of my books even if I am simply going to read them from cover to cover in a more or less leisurely way - fiction / novels / short stories.
Another thing I have been playing with is finding books on tape or CD and their in print version and then I photoread the book and listen to the book on CD in my car. I am planning on then photoreading the book a few more times and going through the book at various paces to play with my reading rates - even into areas where it seems there is no comprehension.