Your experience falls right in line with my own. I suffered a bad break of my left arm and wore a cast for three months and had no strength in it for 3-4 months after that. So righty shooting was the only option. And darned if I didn't shoot better. The distinction seemed to be that I had to concentrate harder with the right, and that was a good thing in the long term. I've long since gone back to lefty shooting, but the lesson of better concentration stuck. In 6 months or so I never got "comfortable" right handed, but it didn't take long at all to establish a fair degree of competence. If I had stuck with using the right too, I'm sure I could have been ambidextrous. But that left handed was too alluring.