I know I am late to this discussion. There is one thing though that has been said over and over that just doesn't compute.
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"If you remove or lighten any of the springs in the sear assembly you are still left with the heavy striker spring. If you have 2 springs which are mechanically linked (one is 2lbs the other is 10lbs) and remove or lighten the smaller spring you are still left with the weight of the heavier spring."
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Your theory is all wrong here. If you have a 10lb spring and add a 2lb spring to it it DOES increase the pull.

it would be like saying I have a 12oz cup with only 10oz coffee in it and add 2oz of coffee. I don't have 10oz of coffee I have 12oz of coffee.

So if I drink 2oz of that 12oz of coffe, I am left with 10oz of coffee.

Springs are work in the same way as gravity in my illustration.

So go have some coffee and take a load off.