If we try to swing across the left leg as opposed to away from it, how much farther forward does the swing bottom move? When my swing goes too much inside out, the swing obviously bottoms out farther behind the ball. Swing plane and ball position are responsible for taking a divot according to The Golfing Machine. Swinging across the left leg takes care of the swing plane, what do we do with ball position? How much more forward do we go?
The Golfing Machine is VERY VAGUE on Ball Position.
Then, there are the kooks that think it should move A LOT from club to club.
I use to prefer one pretty forward ball position for my better players.
It tended to work well for snap releases.
Now days, I customize for all students, but I use this basic idea:
LW up to the 6-iron, club in the middle of the feet to VERY SLIGHTLY forward, ball left of that—obviously.
5-iron up to 3-iron, club VERY SLIGHTLY forward of middle to slightly forward, ball left of that.
Ball off of left heel for driver with an orthodox wide driver stance.
Fairway woods and hybrids between the long irons and Driver.
YOU SHOULD BE SWINGING ACROSS THE LEFT LEG, so now you can have "normal" ball position.