I can spring the cards pretty well, me thinks...
It looks impressive too, for those without the know-how...
I agree that a good grip on the cards is useful but you have to bend the cards quite a bit to get them to spring out of your hands.
You must try and have all the cards spring in one motion rather than in several packets.
I would suggest you practice the springing motion before you move onto catching but when you're ready...
Hold the hands very close and keep them close to your chest aswell. This will help you to cradle the cards as you catch them.
Gradually move your hands further apart.
I would say that the catching hand should be spread wide, almost like a baseball glove. I aim to catch the cards between my thumb and fingers 2&3. with fingers 1&4 supporting the long edge of the cards.
Not sure how useful this is, But hope it helps... Good Luck.
ps a card spring with three less cards, is just as impressive you know,
