Tidgra
I'm at a lost here, I don't understand what better grasp or understanding a dvd is going to do for you. If you learned the sets from your Sifu you should have an understanding already.
Dvd's are a great source of reference and that should be the only reason for them, but if you are looking for dvd' with the chin woo forms just to learn them from the dvd would basically be a big mistake. There are certain suttleties in the forms that you would not be able to pick up and can only be taught by a Sifu, because sometimes you need to feel a certain technique in order to appreciate it's application.
It's not that you can't learn from a dvd but, my suggestion would be if you did learned them from a dvd or a book have them checked out by a Sifu who is a member of a Chin Woo and he can then correct or teach you anything you didn't pick up on a dvd. Good luck on your journey.
Peace
Mantismaster