I have a Wilson Protector, I believe it comes with an 18.5 lb. recoil spring. I am experimenting with some loads. How do you tell if a load is a "light' load or "heavy" load? How do you know when to change recoil springs so your pistol is functioning just right for the load? I've got Wilson recoil springs from 10lbs. to 20lbs. Don't want to ruin the gun by making a mistake. Thanks guys.