So for the aircraft that don’t have EDMs, how do you know where on the lean curve each cylinder happens to be when leaning is by reference to a single probe? If we assume that LOP operations are not only “not approved” but “unsafe”, how do you know that each cylinder is peak or rich of peak far enough? Do the laws of physics and safety only apply to the cylinder with the probe?
You say that the mixture with the smallest detonation margins at any given power setting is peak EGT. Are you sure about that?