I lost track after the first 2 targets as to what gun produced which result but a couple things. 1- The HK was shooting high and the Glock was shooting low. Me, I'd adjust sights to fix that, on both guns. I don't care if someone else can shoot my gun perfectly. If I can't hit where I want I adjust the sights. If, after time passes I see my groups moving, I adjust the sights again. This is why we have interchangeable sights. I am not going to d--k around w/ one gun that always shoots low or high or whatever while my others are fine. I am not going to force myself to use some different technique to shoot one gun differently than the others. 2- The Glock has a very different grip angle than your other guns so it may be that angle simply does not work for you. A totally different gun but my experience may apply. Been shooting Beretta 92s for about 20 yrs. 3 yrs ago I bought an M9A3. By removing material from the lower rear grip surface Beretta straightens out the rear of the grip so it's like a 1911. First range trip I immediately noticed I was shooting 2 inches low at 30 ft compared to my usual Beretta. I shot about 4 mags through it and installed the supplied conversion grip which fills in the missing material. Instantly POI = POA. I am not a Glock fan so I may be a little biased but I agree 100% w/ Alpha Sierra- You've spent a lot of time trying to make your Glocks work and they won't. We shoot because we enjoy it. Why go through life frustrated when you can shoot other guns that you pick up and easily get the results you want? Reading between the lines, you like the CZ and the HK. You pick one of them up, it feels good, you shoot it, it shoots good, and you smile at the results. DUMP the Glocks. Yeah you will lose some money, but I bet 6 months from now, you look back and find this was the best decision you ever made.