Generally most parts are buffed with an up and down motion or side to side motion until the part is ready to be finished. An upward stroke, which is a motion that pulls the part upward against the rotation of the buff is more aggressive and is know as a cutting stroke. A downward stroke is a motion that moves the part in the direction of the rotation or towards the floor is a finishing stroke and will leave the part the shiniest. The downward stroke will also remove most compound haze and leave it the cleanest.
Don't mix compounds on buffs. Once a compound has been used for a buff, that buff is dedicated to that compound. Mixing compounds on a buff will result in a cloudy finish.