Here is something I saved from a BM post on ball position.
"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 used 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.
"