For me at least, pin down is usually not a problem. But I've never had the pin left(and below) of my centerline(righty) before. I don't throw the ball anymore because it doesn't fit well, but I think I could try to throw it and see if it still thumps for me. Could it be the balance hole getting hit? I believe the last time someone heard it, I didn't quite get around the ball as much but I don't know if that will change the track.