My first thought was "I wonder where he learned that".
There are so many variations on the sandwich effect but I've never come across this one before. Seriously, where did you learn it?
I think the placing of a jack on the bottom and a jack on the top and then cutting the deck isn't going to fool many people - especially in Texas, the spiritual home of the best game ever: Hold-em.
I have a sandwich routine but I'm racking my brains and I can't remember where I learned it, so I can't point you toward it, but seriously you need to work on a better handling for this effect.
It's not hard to make a sandwich effect seamless when you... well... that would be exposure
PM me and I'll show you how to disguise the sandwich sleight as a natural display of the Jacks. No suspicious cutting required.
And can I finally add - you need to work on your handling. You looked like you were trying to do it wrong handed for a dare or something.