[DonVoigt]

I agree on the trigger.

If all else is ok on the hold open, it may be riding just a little too high, or the spring may be weak, or a replacement spring that is not pushing it down when it should.

I don't like the sound of brass in the action- unless you want to learn a "lot" about lugers, I suggest you send your mauser to lugerdoc and let him sort it out.

You did not mention if both were matching or not.

Posts are cheap, it may be better to do a separate post for these two different lugers with very different and multiple problems- otherwise it will get confusing to all of us and you really quickly!
JMHO.