I've been following this thread from very beginning waiting for someone who would come with simple "math" explanation.
I've spoken with my Instructor recently about proper trigger placement. He has explained to me :
The thing is that every single pistol is different and there is no magic trigger which would work for each hand.
However there is one trick that can make your shots accurate on every gun - just know the math.
As we know finger is built from 3 phalanges: proximal, middle, distal. Proximal one doesn't participate in trigger pull, however its direction and arrangement is a key to accurate shot.
Proximal phalange MUST BE PARALLEL to the gun during the shot.
If you put too much finger into the trigger your first joint is closer to the frame than rest of your proximal phalange and you shoot left.
If you put too less of finger into the trigger and press the trigger your proximal phalange moves right and you shoot right.
This explanation couldn't be simpler. I've shot multiple pistols, paying attention to my proximal phalange... and the magic happened - perfect score !!!
However it's not so simple and easy to make it working under the stress.. but practice is something what helps here.
Good luck !