[Yoda]

Where do you recommend the ball should be positioned for the Driver?

With the Driver, you usually should locate the Ball just inside the Left Shoulder, i.e., just Up Plane from Low Point. This will permit a very slight descending blow and insure adequate Backspin for directional control.

However, if maximum distance is the goal, then a low-spin 'tumbler' is in order, and this requires an Upstroke Impact. In turn, this requires that the Ball be located ahead of the Left Shoulder at Address (assuming the player does not artificially alter the Shoulder's location during the Stroke and prior to Impact).