How does the pistol perform in another shooter's hands? How does it perform on a bench?
I'm a left handed shooter as is my sister, we both shoot P229r's and notice similar results but for a lefty, meaning our shots land low/right. However, we shot yesterday with a good friend that's a retired LEO, and he shot all of our SIGs and the P229s were SPOT ON in his hands. A lot has to do with the shooter, when you pull the trigger, check to see if your finger is dragging against the inside of the trigger guard. Also, check out the attached chart, this may help you out, before you go changing the front blade...
SIG 1911 .45 ACP
SIG P229R 9mm
Beretta BU9 Nano 9mm
Beretta 84FS .380 ACP
Ruger MKIII 22/45 Target .22LR
PWS (Primary Weapons Systems) MK114 5.56