I'm cross-dominant (right eye), but naturally shoot righty for some reason. When I DO shoot cross-dominant (left hand), though, I experienced the same thing as you. It did, in the end, come down to a (DA revolver) trigger control issue, even though the groups were tight and I extensively dry fire at home as well. Seems I was pushing the trigger ever so slightly just before the trigger was breaking, but never noticed it or even considered the possibility because of all my dry fire. Very subtle, but real. I don't know if that's what's going on with you, we only threw it out as a possibility, but it's easy enough to check