Are you right or left handed??? if left handed, that's how I'd shoot.. if right handed, left eye.. that's tough.
Alot of things factor in...
V8 covered most, but I'd also look at you finger placement when you're pulling the trigger. I tend to shoot best with the tip on my index on the trigger.. yet, a friend shoots his best using the trigger between his two knuckles on the index.
I tend to shoot low if I try his way.
you can eliminate whether or not it's your eyes.. by simply closing your left eye at the range. You really don't need to judge distance, as you know how far away the target is.(providing you see well enough with your right to make out the target:tongue: )
If you're still low/left.. then it's something else.