innaccurate gun or shooter?

[UpTheIrons]

These charts might help diagnose some of your issue:
http://www.reloadbench.com/pdf/files/Ta ... Handed.pdf" onclick="window.open(this.href);return false;
http://www.reloadbench.com/pdf/files/Ta ... Handed.pdf" onclick="window.open(this.href);return false;

At 7 yards, the charts might be your answer. Also, have you adjusted for the hold-on-target aim as opposed to a 6-o'clock hold for the Heine sights?

[TLE2]

I had the same problem with my carry Glock, until I realized the rear sight was sliding freely in the dovetail>