My groups are tight but I keep shooting to the left. My rear sight is adjusted to the max to the right. Only way to get more us move sight to left in dove tail (2300) I watch finger placement on the trigger and grip tempted to move whole sight over to left to get more adjustment.
Don't know if this will help but have a look at it:
Are you sighting in from a rest? What sights are you using?
If the gun is producing tight groups, it is doing its part.
Factory open sights 2 handed 10 meters. The rear sight is centered in the tail but adjusted to the right maxed out.
The gun apparently is accurate, just not where you want the pellet to go. Check alignment of the barrel and the breech. The plastic breech and plastic front sight do not hold the barrel in line very well. A good bump can throw things off. This is one of the biggest reasons to upgrade to a steel breech. Also, make sure the breech screw is snugged.
The stock sights often max out. Most of mine would forever case my pistols to shoot high. I could not adjust the rear blade high enough without taking out the Dremel for moditifations.