Honestly, you don't need a pass that's "picture perfect." As long as you have it down above decent level and some misdirection, boom, you're golden. I'll use the other night as an example, I was doing a sandwich routine for two people at the fair, they were sitting and I was standing. I had the card returned to the deck, and dribbled the rest of the cards on top. I look at them and say "Now, I'm not going to find your cards, the kings are, could you hand me the kings please?" As soon as I said "Now" I looked at them and their eyes were glued to mine. *Pass* Bam. Work's done. I proceed to produce the card and they were floored. I didn't riffle a ton before, I didn't move left and right. I held the deck the same way, got a break, and once they looked away I did it. Does it matter if my pass isn't perfect at that moment? No, it doesn't, because their eyes were not anywhere near the deck, and they had no idea if any move took place. Obviously if you're pass is super crappy, keep practicing. But if you have it where it's fairly quick and you don't fumble the cards a lot, all you need is to get them to look up, it's that simple.
All that being said, if you did your pass in my situation, they probably would've suspected something. All that toying is very unnecessary. Just look at them, say something, and get their attention. Then do a pass without a massive amount of riffling and noise, and you're good.
Jacob