Rapid70 Prod Shot String

Tuned my custom Prod tonight to shoot the JSB .22 Monsters 25.39 gr for 8 shots. I got a decent 8 shot curve with some good power. Any ideas how to make things better. Haven't had time to group them past 12 yds. At 12 yds, I'm getting one hole. Fill pressure is 3000 psi to 2300 psi. I bought this gun from another member. He put in a heavier HS in and did some transfer port work. 8 shots are all I need for this 25 yd application. What do you think?

1: 648/23.68

2: 654/24.12

3: 659/24.49

4: 660/24.56

5: 669/25.24

6: 664: 24.86

7: 660: 24.56

8: 649: 23.75

SD: 7.2

Spread 21 fps