So guys.. I am playing with some ideas for the script working around the central theme of "markings." Don't have any real details worked out yet but essentially making the claim that its a marked deck, and then showing several other ways that cheater's will mark cards. This theme is great for this effect, because it draws a lot of attention to the backs of the cards, gives a good excuse for why I want them to say stop (during the selection process, I've been having one spectator close there eyes and tell me when to stop while the other spectators watch me, then they open their eyes and I deal the next card to them. This is what allows me to use the bottom deal as a force from my seconds), allows me to claim that I am "reading" the cards as I deal them, hence motivating the turnover action. But, I have hit a bit of a brick wall and would love some help on this, resources or direct advice. So the whole idea of marking draws tons of attention to the backs of the cards, which is great for every part of the trick except one; when I have them sign their card. At the moment, spectator's instinctively try and want to look at the back of the card. To try and see the "markings." I should also point out that I am currently allowing them to hold their card after they sign it, so that the final reveal happens in their hands.
I have tried to allow them to inspect their card before I do the switch, and that changed absolutely nothing. Still one of the spectators always tries to check out the back. I have literally had the card signed with one of my fingers holding it to the table, and then picked it up, placed it onto their open hand, told them to place their other hand on top and hold it tight, and they literally turned their hands over to spread their fingers and look at the back.
I feel like the idea of hidden marking's is currently coming across in some way as challenging, how do I fix that? Also while it might be my overall audience management skills that aren't working here, but I feel as though there is a very simply psychological solution that I am just not seeing here.