I think exactly the same way than Dimitri. I think that the incongruity in the Scharzman subtlety in the tilt illusion is something you must work. You´re trying to make them believe that the card is in the middle by the subtlety and cuz you´re holding the card face up. But that´s not the right way to do it. Why? Dimitri says: Why would you say that's about the middle, then pull it out? Exactly. You´re a thinker men, you have a very good idea, but maybe you should change the way you do it, and create, for example an Convincing accidental element.
Let´s see. you do the second (?) revelation of the card on top, you show the card, if you create the right atmosphere, this second revelation must be follow by a moment of easing (tension-easing) and you turn the card face up and say something like: the card always jumps to top of the deck is unbelievable, so when you say this you take the top card in your right hand, and without looking you start to put the card in the middle, so when you look to your hand, you are already doing the scharzman subtlety with the card face up (the diference is: this is an accidental way to do exactly the same thing you want) now, without hesitation, and without any kind of comments like: Oh, the card is face up in the middle of the deck!!!. I mean, you´re talking you start to buried the card, but you do it in the wrong way. What do you do? turn the card face down and buried, without any comment.
I don´t know, this is only a example, i think you must create you´re own ways to do it. And in this example you´re create a logical situation to remove the card for the middle in the subtlety... i mean, the card was face up!... I hope you understand that is way i think, its only mi perception, don´t take it like a lesson or something, ok?

Another think is in the beginning in the rifflle, when you do a force, any kind of force, and you need to move a card from top to the middle of the deck, you must do a pass, or any other technique with no external life. Dai vernon advice.
During your rutine you move the center of attention (your hands) from one way to other, you change the position of your body all the time cuz you´re changing all the times the foot of support, when you practice the next time take a piece of paper and cut it of diagonally, and then put your foots in that position ( in the V shape) that makes that one leg is more bend that the other so is avoiding the movement form one way to another.
I think you must do all the phases more slowly. The ACR has something that only a few others card tricks have: the posibility of a progresive repetition. So the clarity is very important in the explanatory phase. I hope some of my ideas could help you. If you have troubles to understand is because my english is not very good...