Best AFR for consistency

C130 Chief said

Ideally you want the same AF ratio. For bracket racing you want consistency and predictability. As others have said, once the tune-up on the car is settled, most racers will leave it alone and keep notes on how their car runs compared to density altitude. That way dial-in numbers can be changed based on past performance.

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Would you not want to have a tune up that made the car the most consistent? Is it possible AFR is a key factor in a consistent set up that changes less with weather making the car easier and more predictable to dial? I am trying to flatten the trajectory similar to predicting vertical hold when shooting a bow vs shooting a rifle, the flatter trajectory is much more forgiving to hit the target.