Same thing I always say. Tune for best performance.
In other words don't worry about the AFR number, much less aim for any AFR number.
Use the AFR to see the effect of changes to carb restrictions under various conditions. How to read carb calibration chart?
To track the AFR relationships under various low throttle and part throttle situations, MAP and TPS are useful in addition to RPM. AFR gauge with o2 sensor worth it or not?