My injog shuffle is super inconsistent, particularly when I have run cards on top of the selected card. Sometimes I injog the perfect amount, sometimes too much, sometimes too little, and sometimes cards stick together, sometimes multiple cards come off when I try to run a single card (although gripping the right hand packet harder does seem to stop this), and sometimes the cards are shifted as the right hand moves away from the left. I've made a quick video from my perspective and I would be grateful for any tips on what I'm doing wrong: