Sorry man, and no offense or anything, but if that were a real game, you might be dead
Try angling your hands differently and getting it down a little smoother, not necessarily fast. I noticed when I practice my gambling tehcniques, those casino cards are VERY difficult to work with. It might be that they are too soft or smooth, or thick, or anything else like that. I moved back to bikes and the sleights were completely invisible. You are definetly making great progress however! Just for the record, how long have you been practicing this?