using the epa to reduce servo through reduces the controls resolution for fine movements. The farther the linkage is away from the spindle the greater the force on the gears of the servo (gears can throw teeth) the servo hads its maximum strength when it is near the spindle but you loose fine control of the servo. The control horn get max strength put on it on the outer hole but requires more movement to get the same angular movement. (mechanical adjustment is the prefered method of adjustment)

epa is % of standard servo movement

yes 80 % of the epa