Sorry to hear that you are still experiencing problems with your luger. Another thing that comes to my mind is the feed ramp. Take a good look at the frame ramp and the barrel ramp. I had a commercial luger that had it's feed ramps cut with a very dull tool/s. As a result, the tool/s left significant horizontal tool marks/ridges in both feed ramps. These ridges slowed down the feeding speed of the new cartridge and caused a jam. I know I may be reaching here, but it is worth taking a look at. You stated that your Luger functioned when you oiled the cartridges, and that leads me in this direction.
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