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A lighter hammer does necessitate a harder main spring if the input pressure and the valve spring remain untouched. The only way you get to use a lighter spring is if the forces on the other side of the valve are decreased. Less force on less mass is less energy to do work. If the other side of the valve has the same pressure from gas and spring, it's ability to do work is unchanged. So it wins, and the valve stays closed. A lighter hammer must have a correspondingly harder spring to be able to do the same work of balancing out the forces on the other side of the valve.
Jhyan is correct that this will stop the bouncing of the hammer off the tube and increase efficiency. But as you harden the mainspring more, you increase the amount of force that is pushing against the valve all the time, even when the gun is uncocked. You can only take it so far. You'll also be making the gun harder to pump as you increase the main spring. Things to think about. Enjoy the tinkering, just keep in mind that there's always a trade-off to be made.
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