Video tape yourself
If you are 14 years old, as you say, then I have a hard time believing you have both a "heavy roll" and a rev rate around 350. My younger brother is 12 years old, and throws 14lbs, has a rev rate of 210... and gets the 5 pin out with no problems.
I would like to see a video of you bowling, because when I read this it screams your comming around the front of the ball and making it spin like a top, making the ball never really catch the lane and you get left with 5 pins. Also... are you throwing reactive???