Dear Mike:
The Geco 124 gr. ammo is loaded hotter than hell, so I'm wondering why it wouldn't kick back your action.
It sounds to me like OAL could be part of your problem. If you can measure them, if they are shorter than 1.173 inch and they are round nose ball, expect feeding problems. The sad thing is that most modern ammo is loaded to 1.169 inch, too short to reliably feed in a Luger.
If you want better function with regular, readily available ammo, consider having your recoil spring changed to one balanced to it.
If you can reload your own, this is the ultimate answer.
Several folks here can help you with your spring questions.
Sieger
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