You are close; unfortunately, many subtle variations prevent a "here is the perfect jetting for you" kind of answer. You have as close an answer as can be expected, i.e. a range of proper values for jetting. Start on the richer end of the scale especially to break it in, and the worst that will happen is, you may foul a plug. Go leaner incrementally until it runs great following the steps in the site you reference, then go one step leaner and you should experience a bit of lean stumble. Go back to perfect, you are done.