My son who is 11 shoots a 2.0 in uspsa and the gun doesn't ejection brass well. The recoil spring has been changed to a taran tactical 13lb spring. Brass ejects about 4 in out and 6 in back. I know some problems are my son's grip he will limp wrist pistol. I am wondering if spring is too light? I would like to see brass further out. We shoot cci 115 9mm if that helps.