I had the good fortune to shoot with Jerry Miculek a few years ago at a junior camp (when I was a junior). He covered this in great detail. According to him, depending on target distance and separation, your split time should be about the same as your transition time. If you have .10 splits but your transition is .25 slow your splits and really snap the gun. With slightly slower splits but faster transitions, you're not losing time and you're moving through targets faster than you would if you were just "double tapping". Hope this helps.