This is my first SH sight and I'm having trouble getting used to the pin system it uses. I feel like I have both the height screws tight on a given pin and then next thing you know, my whole pin is loose. It's gotta be operator error so let me ask...what's the key to honing these things in and having everything tight in the end? If I mess with it long enough I tend to get it but I feel like I'm turning things in opposite directions as the previous time to get the same results. And of course, the directions are nowhere to be found.