This is a personal preference area. Acceptable ball position is somewhere
between the middle of your stance and heel of target side foot, with your hands
slightly touching your target side leg to a hand-thumb out from your leg at address.
To find your best spot, hit a ball from all 4 corners of the ball box and gradually
adjust until you optimize ball contact and initial direction. Some players find this
spot with every club. I think it's more consistent to have one spot for all clubs
and change your spine angle and width of stance to accommodate the club you
are swinging. Obviously, you can affect direction and trajectory by adjusting the front
to back parameter. Front is higher trajectory and possibly in the direction of the
front foot. Back is lower trajectory and possibly in the direction of the back foot. I
say possibly because you could change your swing path if you wanted to. After all,
you can do whatever you want. Understand that a slight realigning (positioning) of your
body or clubface may be easier to do.