When I shoot fast (Line of sight point shooting), my eyes look for the yellow, when it crosses line of sight,BOOM! I use to swap out my 686 inserts for bright yellow or gold. Red, for some reason, comes out black for me in most circumstances. I then have to consciously line up back and front blacks. Takes too much time. Yellow, BOOM, yellow comes back down, BOOM!
Works for me, don't know about others.