ked, yes you are going too slow. You should be finishing 200 pages in 20 minutes. As to whether you need more layers; who is to say. Try speeding up. It's those dips that get you for speed. Relax and pick-up your speed in the dips. With practice it will become easier. Sometimes these changes just kind of hit you, with "Hey I'm really zipping here". Unfortunately you often drop out of the zip when you notice it for the first time. Don't try and force it to happen again. Remember it happened before because you were relaxed and focused on the destination and not the method. It will happen again and again, and then you won't say wow anymore and you won't drop out of it anymore. It will just be what you do.
Use the whole system. Use if regularly. Have confidence that your are essentially the same as all the other people that use the system. Most of whom had to stay with the system before really getting it.
Those are the three key elements that address your question. Others are also in the PRWMS, including: relaxation, releasing expectations, powerful visualization (purpose setting), and maintaining a comfortable focus.
Look at your practice or PRing and see which of these elements you may not be fully implementing. There are many techniques in the book and course material to help you develop these elements.
I know it can and is working for you. Just be open to noticing the small steps to your destination, and celebrate those successes instead of looking at the distance left to cover.
You are perfection.
Iam2 
