Your target and test conditions were apparently far from ideal. I couldn't even see that target at 25-yards, so you definitely get the "Eagle-eye" award.
Get some standard targets. At 25-yards, I like the B33 for an aiming point (not necessarily for scoring). Take the load you are most comfortable with and make up 500 of them. Then shoot 50-75 rounds every time you go to the range. (Shooting too many rounds wears you down, and unless you are a really top-level shooter, after a certain number, most shooters will tend to stop "learning.") Shoot carefully. Take breaks and rest your eyes.
By the time you slowly and deliberately work your way through those 500 rounds, you will know a lot more about that gun. I bet you will be impressed.