My point about using 8 cards was that one of the assets of this effect was its clarity.
Using 8 cards makes the trick easier to follow (less clutter).
Also by process of elimination if you are holding 4 spot cards (which you continuously show), the cards on the table must be the Aces. It is a psycological reinforcement that the cards on the table must be Aces due to process of elimination. This is what makes the trick strong.
As the trick progresses, it gets more impossible. The first transposition is good, but the audience may think that had they been paying closer attention, they could have seen the switch.
When it happens a second time, the audience should really get the message that what you are doing is impossible. They were paying closer attention yet they saw nothing.
Before you make the third Ace transpose with the spot card, they believe you are holding the 4 spot cards and they see 4 cards on the table - 3 face up aces and one face down card that they know to be the last Ace (process of elimination). When the final transposition takes place, they should be devestated. This final transposition is the strongest . That is the psychology behind the effect (and my explanation of why I believe it is strong in the eyes of a lay audience).
As I have said before, this has been a standard effect that I have done for over 8 years and my experience has led me to believe that it is one of the most powerful effects I have performed.
[ October 31, 2001: Message edited by: Mark Ennis ]