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Brian, my ballistic calculator is having fits trying to calculate the shorter indoor distances...
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It will shoot low at short distances because your bore is lower than your scope/sights. In your case, a LOT lower than your scope.
The bullet will start out at the muzzle which (based on the picture of your setup) is 2-3 inches lower than your scope. Assuming you zero it for point-of-impact=point-of-aim at 25 yards, the bullet will follow a more or less linear upward path until 25 yards where the bore line and the sight line intersect. They will intersect there because that's where you adjusted your scope to make them intersect.
Nothing you can do, as far as adjusting your scope, will prevent the gun from shooting low at short distances because nothing in your scope adjustment can compensate for the fact that the bullet will always start out 2-3 inches below the scope.
You could mount your scope lower on the gun (not as high above the bore) and that would help some, but realistically, 2-3 inches low isn't really a problem. Pick a convenient zero distance--maybe 25 or 50 yards--and then shoot it enough so that you have a feel for where it's going to hit at various distances and call it good.