Hey guys, I just got my scissor cut down this past month (finally!) and thought I never could because of hand size. Here's some troubleshooting tips that may help (they sure helped me):
1. Grip those cards as far away from your thumb as possible. In other words, when in your elevated straddle grip, push the deck out with the thumb so that your ring and middle stretch out away from the thumb. This makes it easier for the packets to clear later.
2. Grip the deck at the fingertips. When I do something like the charlier, I feel like it's okay to have it a bit deeper, but with the scissor cut I needed to intentionally keep it gripped at the very tips. When it's too deep, it blocks the packets from clearing.
3. Your middle finger is your best friend. Once your thumb has swung out with the top packet, pushing down with the middle should clear the bottom packet over the top one. This 3rd one was the biggest thing I had to condition my hand to do. After that it was just cleaning up everything.
I hope any of this helps. It's honestly just tips from Genesis v1 plus what I've experienced, so you may not see anything new here. But I felt my hands were too small myself, and now I'm rocking it. Hang in there and good luck!