That sounds good in theory. And would work any time the weather conditions are the same as when that tune was done. But the reality is that trying to get that sharp of a tune for a car that will be driven in different weather conditions will mean that sometimes it will probably be too lean. And sometimes too rich. But our engines are much more tolerant of a rich condition than they are of a lean one. So to be ready for the varied atmospheres that will be encountered, the transitions will need to, unfortunately, be a little bit on the rich side.

Unless the OP wants to adjust his tune to the weather conditions on any given day.