I got the Wolff "Calibration Pack" to try the higher strength recoil springs. Also included is a firing pin spring that says, "extra strength" or "extra power" someting like that. What does this mean? Is it a stronger spring, or a lighter spring to give more firing pin velocity, striking force? I wouldn't think you'd want a stronger firing pin spring on a gun that is already prone to light strikes and a lighter one may negate the drop fire safety margin?