About the unit speeds, the only thing I can say about them from RTW-
CA must have had an Aboriginee and a horse with rider run side by side and compared the speeds, because here in Kentucky a man without armor carrying only a sword running flat out against a horse with rider carrying a sword simply can not run that fast away from the horseman. Beats me where they measured their running speeds. Maybe in Medieval times everyone ran like Yule Brenner decked out in full plate mail armor?