Might try 124 gr, lots of loadings/projectile types from target to duty use.
If I'd experienced what you did, I wouldn't carry a VP9 on duty anymore and just leave it at home. Have you tried any of HK's hammer options? Perhaps something with the LEM?
Please let us know what HK says and does for you. I would think they would be all over getting this addressed since you are LE.
HK - No Compromise
When I can carry I almost always carry a VP9 Never had any issues except one primer which sizzled but did not ignite the powder. I waited 30 seconds before ejecting the round. Looks like primer was put in incorrectly. I have tried numerous rounds and have racked up over 5k rounds now.
I have not had any 9mm ammo issues with my VP9. I have fired the follow rounds.
For SD I have fired at least 50 rounds of these types of ammo:
Winchester 124gr +P T-Series
Winchester 147gr Q4364
Winchester 147gr SXT
Remington 147gr Golden Saber bonded
Remington 124gr +P Golden Saber bonded
Speer 124gr Standard Pressure Gold Dots
Speer 124gr +P Gold Dots
Hornady 135gr +P Critical Duty
Federal 124gr HST
Federal 147gr +P HST
Winchester 147gr Range T
Remington 124gr +P Black Belt
Speer 147gr Gold Dots
Winchester 147gr FMJ Training Rounds.
Fiocchi 115gr FMJ
PMC 115gr FMJ
Blazer 115gr FMJ
Winchester 124gr NATO