Left Palm to the Ground at Impact

I continue to recommend a strong left hand grip on the club with at 

least 3 or 4 knuckles showing.

Remember with this in place on the club, it requires that the left

arm and hand need to be leading your downswing and your left 

palm should be facing the ground at impact to prevent a low 

ducking hook.

A good full hip turn on the backswing with left side leadership 

on the downswing will produce powerful, long and straight shots.

Lift the Left Heel for More Distance

Although certainly out of vogue in modern instruction, most if not all great

drivers of the ball for length and accuracy in history allowed their left heel

to rise sufficiently on the backswing.  Nicklaus, Snead and Jones come

quickly to mind.  All three allowed the left heel to rise approximately 3

inches.  As the heel rises on the wind up the weight rolls inward and up

on the left instep.  This allows the left hip to turn well around (another thing

not taught today) to allow the club head to be delivered properly and easily

to the inside of the target line.