The reason MinnFlyer had you connecting to the 6 arm servo that way is to give you "differential ailerons". The purpose is to give more "up" travel than "down" travel. This reduces the drag induced by the lowered aileron compared to the raised aileron. In turn, this reduces a condition known as "adverse yaw" which is why you need to add rudder to make a coordinated (smooth) turn. This condition is especially relevant in full scale a/c where they even design the aileron itself to assist in the differential.

Bruce[