Are you sure your right eye is dominant? When I went from just plinking at the range to pratcical shooting, I thought I was r. eye dominant. When I started bringing my left eye into line, everything became clearer.
Another trick to practice is to take a pen between your thumb and forefinger at arms length and point it at small objects. Move it to different aim points at various distances. That helped train my eyes to work together. The benifit is you can do that anywhere.