David Vizard (first? 40 years ago) suggested that higher atomization (as produced by annular) increases the volume occupied by fuel, which reduces the air volume. High atomization is best in heads with excellent CFM capacity. If the head isn't that efficient, larger droplets (normal booster) means more air volume.
Mixture strength, air:fuel
By weight 14.7:1
By volume (fully vaporized) 9,400:1

An obvious try-out:
Annular for tip-in and part throttle response, and smaller HSAB to reduce the effect at higher RPM?