I spent a few hours shooting at 3D targets yesterday and even the shots I would consider flyers if I was shooting spotswould have dropped any deer within sight of my stand. I am a pretty fair shot but balance in even a slight breeze can be tough. Those limbs are like sails..

I have also started trying to shoot ONE arrow at a time. Flinging 50 just leads to fatigue and not improvment and after all it's the first arrow that counts..
My tree stand practice is usually off my knee anyway along with a few over the shouder shots. I shot a buck last yr. @ 31yds off my knee and missed my POA by a few inches. Still doulbe lunged him..