Okay so this trick is to give the illusion of a penetrating card, right? As a spectator I would like to see the back, the most logical explanation would be some sort of sticky bent corner. Is there any other angle you can perform this at? These cards aren't really sinking, more penetrating, perhaps "Razor Cards" would be a more appropriate title?
If you want this to be a trick on the WIRE I suggest you think of applications for this trick to a magic routine. A good trick is one that works well, and cannot be duplicated by the laymen that you're performing for.
-Bryant