Weak 10s increase the entry angle. 4° at 12mph isn't enough. 6° at 12mph will carry the 10 pin. 11° will leave a stone 9. The best way to increase your entry angle will depend on axis tilt and axis rotation. But I will guess and suggest moving your feet one board to the ball side and use the same target. This is merely an educated guess based off some of your other posts giving clues to how you roll the ball.