In orded for approach circle to cover smaller distance during same amount of time its speed has to DECREASE and thus AR11 could be made AR9 just by decreasing travel distance enough.AR11 refers to the circles closing over 300ms. AR9 refers to the circles closing over 600ms. The distance the circles travel in closing is already affected by circle size. You are completely incorrect.
But if you are willing to change the laws of physics and actually increase the speed im all for it.