Agent, the world of a double barrel gun, even a shotgun, revolves around the barrels being regulated or properly made to hit the same place. This is not as easy as it might seem at first...
There are two other mental things...
One is the recoil is throwing you off the second, punishing, shot. I'm not allowing physical changes into the issue as that would be too obvious, as in "hey Matt, after I fire my first shot I'm pointed at the clouds and my second shot, when I think I'm back on target, misses -- why?".
Two is just the feel of the shots are playing with your head... The under-barrel has a more direct line of recoil and some serious Trap shooters use single under-barrel shotguns (known by us as unsingles) that have very high ribs. Can you fire the under-barrel first and THEN the upper and see what happens after a few boxes of that?
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