Double check the cleanliness of the well that the magazine hold-open fits into. It may be full of stuff that is artificially pushing it up into the path of the receiver. There could also be damage in that area.
Double check the recoil spring linkage, and proper installation of the hook that links the toggle action to the recoil spring via an "S" linkage.
The Luger is a unique action, and not that many gunsmiths are familiar with it. If someone is near you on the forum, it may be possible to get help directly. Your location is not showing up in your profile.
We have a useful reference FAQ that may have information you can use. Follow the forum links at the top of each page.
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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