4 shooters have shot it with 2 hands from 15 yards. It shoots about 3.5 inches left and 3 inches low for all of us. Haven't used a bench yet (these are all good shooters). But, it's good advice to try the bench before cutting.
And just to clarify, if you're looking at the front sight from the rear of the gun (like you were shooting it), enlarge the rear sight to the right. That will allow the barrel to come to the right to center in the rear sight. From what I'm reading this is the only way to change the horizontal POI (other than shooter error)?
I shoot Glocks in my profession so I'm aware of trigger placement and trigger jerk. (BTW, I like the Open Top much, much more than the damn Glock).