[Yoda]

I know that we are told to hit down, hit down, hit down. If you are not sure if you hit down on the ball, assume you did not. But does this hold true for the driver as well? I know technically speaking (according the slo-mo video on golf telecasts) that the driver probably bottoms out barely after impact. But should I be 'trying' to hit down with the driver? Do you guys feel the downward movement thru the ball? Should the club 'feel' as if it bottoms out at the ball? or after impact?

Your thought should be to swing the Club Down Plane...

Down Plane to Low Point (usually opposite the Left Shoulder) and Down Plane to Full Extension of the Left Arm and Club.

If, at Address, you have located the Ball "back" in the Stance -- Up Plane from Low Point -- you then will swing down and out through Impact.

Otherwise, Impact will occur after Low Point, and you will meet the Ball on the Upswing.

Of course, most Golfers disrupt this essential Stroke geometry in any number of ways, but that is another story.