The Wolff springs are not to spec. They don't even look like the originals. Wolff only specifies the loaded force, they give no other specs. To specify the spring you need loaded force, preload force, unloaded length, number of turns, etc. The preload is critical in the Luger. I'd get an in spec spring from Luger Doc before I went to Wolff. But first figure out what you actually have in the pistol. "Tired" springs are an urban myth. A spring does not weaken until just before complete failure.
I have the spring specs, but I've recently moved and stuff is still in boxes. One of the other people here should have the complete specs. I did have a setup to measure Luger spring forces and ran measurements on the motley assortment I had in my shooters. I have one with an unsafe recoil spring. Aside from not slowing down the cannon enough and allowing it to batter against the frame it does not reliably close the action all the way. This is a BIG safety hazard as the disconnector will allow the trigger to connect with the breech block slightly back and the toggle not locked. The consequences of firing in this state do not bear thinking about. I've fired a few empty primed cases this way to prove the point.
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