Rapid reading is not one technique or approach to a book.
Rapid reading uses all the techniques of activation. It combines superreading and dipping, skittering, analytical reading, rhythmic perusal and even PhotoReading speed as is appropriate for your needs and the page you are looking at.
So when you say you skipped superreading and dipping for rapid reading what you are really doing is skipping activation in favour of your old reading habits. The only thing that rapid reading has in common with traditional reading is you start at the beginning and end at the end, doing a once through. The actual approach to reading during rapid reading varies. Imagine a canoe going down a river. The speed varies according to the nature of the river. in Rapid reading the speed varies according to your needs, prior knowledge and previous activation.
Make the effort to use at least one to three of the faster activation layers before you resort to the combined techniques of rapid reading.
Alex