meadowlark, it could well be that the cartridges have marginal power for your Luger. Other considerations are the magazine (I use Mec-Gar mags) and if you provided adequate resistance to recoil for the action to work properly. IMO and experience, the Luger is more sensitive to "limp wristing" than newer designs.
WRT the POI being high, that's not unusual although the cartridges you use can effect POI; e.g., a 115 grain load may shoot lower than a 124 grain bullet. Depending upon how high, you may want to contact Lugerdoc (Tom Heller) and see if he has a higher front sight blade that will lower the POI.
Keep at it and you'll get your Luger working like you want.
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