i use the following:
miller cascade control, available at dan and daves on demand
clip shift dribble control, available on surfaced by chad nelson
top card cover herman pass, sorry i dont kno if thats the actual name.
and play around with doing a kind of 4 for 4 switch but with a half packet of cards, i do this wierd variation and it looks very convincing, just dribble the cards, have them place the card on the left packet, then turn the right packet wich should be in biddle grip face up with pointer finger and then do the 4 for 4 switch but with the one card.
hope this helps
-Danny