I vaguely remember hearing that the Japanese may have used LOP technique to get the extreme range they achieved with zeros in the war. I've read a few books where they talk about some specific leaning procedure but don't expand on it much past that. Definitely have read the notes on big radials in DC-6/7 and Connies dramatically increasing reliability and life using LOP technique. They were getting some impressive TBOs on those big radials by the time the jets took over.