^^^The way I understood what Pat was saying, even when he was talking about going from 11-4, was that he was talking about pulling the racquet across the ball and carving it - therefore it would equally apply to your dwell time theory. At no point did he talk about hitting down on the ball or demonstrate it either.
However, if it helps you to think about hitting down on the ball then by all means go for it.
I tweet - @ashtennis guru (no spaces)
I Shoot - www.flickr.com/photos/ashtennis guru/ (again no spaces! grrr)