You run a series at different levels of S/Au, temperature and time. The measurements are speed and fog. From the optimum time and temperature, you can derive Kilo Calories input / mole of silver. If you then vary the temp/time or rise and fall profile, but keep KCal / mole constant, the finish should give about the same result but with slightly altered properties. I don't intend to go into detail any more than this. It is one of the little factors that those who say they "know a lot about emulsions" never seem to get around mentioning.
Just as we had models to work with making and scaling emulsions, we had a computer program which did all of this for us. Unfortunately, I am reduced to doing this all by trial and error, and at great cost in time and silver nitrate.