CJ brought this up a little while ago. Grady Matthews also told me the same thing. Move the tip up to the cue ball then only move it back and forth about an inch or so.
Here is a good example of what they are talking about:
http://www.youtube.com/watch?v=bPoEsgzEeqk
Here is a good example of what they are talking about:
http://www.youtube.com/watch?v=bPoEsgzEeqk