On your trigger issue I'd start by checking the operation of the sear plunger, verifying that its movement is free and correct. If it's sticking or otherwise not operating properly a search of the two Luger forums will reveal several ways to fix it.
If that is not the culprit please report back, and more detailed troubleshooting should reveal the problem. Trigger/sear issues are not uncommon but are often easy to fix.
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