The trigger on a Luger should not be moving sideways once the spring is seated, and the side plate is installed. What does your trigger return spring look like?? Sound like your spring has been replaced, as std. Luger trigger return springs apply a good bit of forward tension to the trigger.
What does the trigger look like out of the gun?? I am wondering if yours has an inordinate amount of wear. Remove the side plate, the trigger and return spring, and give us a photo of the parts, and the area where they install. Perhaps we can find the problem.
Lugerdoc(Tom) has trigger return springs I believe. I fear that there is more to your problem than a return spring, but the photos will help decide.
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