Hi George,
Welcome to the forum!
This could very well be the recoil spring, since the wrong one or a weak one could account for this.
It could also be the way you're holding and supporting the pistol when firing.
You need a tight grip, straight on without bending your wrist.
Lugers can be rather sensitive to the grip.
This could also be lubrication related. Have you cleaned and inspected it?
Incomplete closure could be caused by the extractor being gummed up and dirty. If you disassemble the breech block don't lose the small spring under the extractor and observe the way it's inserted and mounted.
Inspect the face of the extractor. It should be smooth and slightly curved.
Marc
__________________
 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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