The new model coil spring Lugers had two different recoil springs for 7.65 and 9 mm calibers. Many shooter grade Lugers have had their springs tampered with and many are out of spec for that reason. The spring will actually weaken only shortly before total failure so that is seldom a problem. The real problem is that people tinkered with the springs in the misguided belief they weakened or needed to be changed to accomodate current ammo. Neither is true.
Clipping the end off a sping actually stiffens it. What you are reducing is the preload and compressed load, not really a good idea. It promotes the possibility of the action not quite closing, leading to the possibility of firing with out being locked. You DON'T want to go there.
The Wolff springs are over long, resulting in a higher than proper preload. Probably the best result with a Wolff spring would be to take the stiffest Wolff spring and trim it a bit to reduce the preload. I can't say just how much one would tirm it. A judicious trim will not cause any safety issues and would get you as close as you are going to get with a Wolff.
As Georg Luger himself said, "The springs have to be right."
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