First,
The Shield's sight adjustment IS THE FRONT SIGHT.
Normally sight adjustment is THE REAR SIGHT. but NOT SO WITH THE SHIELD.
TO adjust NORMAL REAR sights YOU MOVE THE SIGHT IN THE DIRECTION THAT YOU WANT THE BULLET IMPACT TO BE.
The SHIELD'S adjustment IS THE FRONT SIGHT, so in this case,
YOU WOULD MOVE THE SIGHT IN THE OPPOSITE DIRECTION THAT YOU WANTED THE IMPACT TO OCCUR.
In your case YOU WANT THE BULLET IMPACT TO MOVE TO THE RIGHT,
You would need the FRONT SIGHT to be moved TO THE LEFT.
Scribe a line on the dovetail slot TO MARK THE ORIGINAL SIGHT POSITION.
Use a SIGHT PUSHER to move the FRONT SIGHT TO THE LEFT.
Possibly you could use a BRASS PIECE/HAMMER to tap it over.
***Note****
Your GRIPPING of the SHIELD and How MUCH TRIGGER FINGER you are using may be PUSHING THE IMPACT LEFT.
Hope this helps.