I guess my take on it would be that Paul has setup guidelines and then suggested we play with them. If a shorter distance works for you, why mess with it? My ideal distance probably works out to be somewhere between 18-24 inches. If you're getting the results you want, roll it into your version of Paul's procedure and run with it. That's part of the value of this forum, finding and sharing ways of getting results that may or may not track exactly with Paul's plan. This gives us an opportunity to build on the foundation that the Whole Mind System provides. As we see variations, we may find techniques that work better for our own situations/dispositions.