personal preference

This is a personal preference. Acceptable ball is somewhere between the middle of the course and the objective of heel bottom of the page, with your hands to touch your target easily to the leg of an inch from the hand of your leg in the address. To find the best place, took a ball from all 4 corners of the ball and to adapt gradually until you optimize first ball contact and management. Some players find on the spot with each club. I think it is more consistent from one place for all the associations and change your angle of the spine and latitude of the place, for the club, you balance. Of course, you can, at the direction of the trajectory, and by adapting the front-to-back settings. Before the trajectory is higher, and perhaps in the direction of the front foot. Back trajectory low, and perhaps in the direction of the rear foot. I say maybe because your momentum could change if the path you want. After all what you can do what you want. Understand that a slight shift (positioning) of your body clubface or perhaps easier to do