do not tilt at address ..at top of BS, hip start forward and head stays in place ...this will automatically cause a spine tilt which gives you an inside approach into the strike and is a key for the creation of the "flat spot" impact zone
in TS, weight shift and start of torso rotation causes the left arm to press (abduct) against the chest ....in DS, keep the external extension of the right arm intact ...do not go into internal extension because it will steepen the shaft
there is very little fwd shaft lean with driver (compared to irons)...instead spine is tilted back and you hit up on ball (hands' wrists conditions are the same as with irons)