Like archer58 says "watch that arrow all the way to the target". Local pro here calls it "shooting blind" if you don't. You'll be surprised at the differance it makes. Also, a good group can be gotten at 20 yds. but if they walk to the left or right (depending on L/R hand shooter) as you back up but are still good horizontally the sight could just need some fine tuning. Adjust the site starting at 40/30 til you are happy and when you move up to 20 you still should be on. Also, I was told you can't always rely on those levels, some have been known to be off due to sight or bow who knows.