
Well the first flaw most likely centers on the fact that you make a big deal about the paper and jotting down the information. This is very typical of magicians in that they are used to drawing attention to the article they are working with -- "See the coin, now watch..." -- with billet work of any kind, the billet don't exist, it is an aid for the participant e.g. any time you (the performer) touch it AFTER they've written on it, there is a reason for suspicion.
There are those in our world that swear by the CT... I'm one of the few that will swear at it, seeing it as one of the least convincing bits of business in the whole of magic but most particularly Mentalism. It is likewise an overly exposed method which makes me ponder even more, why anyone is still using it in the way so many do.
As to how to overcome your problem?
Well, without watching you work I can't give you specifics but I will stress a few points that are most common with folks;
* Don't Make the Billet an Item of Focus
* Don't Rush the Routine -- Time is Your Friend! (within reason)
* Don't Make the Reveal a Word-for-Word Reveal but rather, hint at the information and lead them with enough description that the audience concludes that you have made a hit.
* Don't Do a bunch of Card Tricks before and after this routine and expect people to see it as something Psychic (don't expect people to buy into your mental abilities if you also do a lot of magic.)
There are other factors; your age and the age of those you are dealing with as well as their personality types. Sadly the real world is filled with jerks (male & female) who hate to be fooled and will do everything they can to screw with you no matter what you do or how good you are with the technical side of things.
Look at your people skills in that this is your most potent weapon and tool when it comes to cultivating misdirection, the investment of belief from your audience as well as the psychological acts of detouring them away from the logical assumption (which is where your problem lays).
Of course, there is one other thing you can do...
Learn alternate methods and use them!
