Actually the maximum draw shots made by trick shot artists like Mike Massey are done with the cue elevated at a near ninety degree angle to the table. They shoot straight down on the cue ball, hitting the back half of the ball. It's a full force total masse shot (I don't know another name for it).
This is the shot where they make an object ball (placed near the cue ball) in the corner pocket and draw the cue ball along the rail all the way up table to make another object ball in the opposite corner pocket. The cue ball takes off at 100 mph and races up table to make the second ball. Mosconi and Fats used to shoot this shot in their exhibitions too. I'm sure others have used it as well.
Of course Massey also shoots a shot where he places the cue ball about an inch from the object ball and draws it three rails around the table to make another ball. This is done with a more conventional (level) stroke.
My own personal opinion after hitting about a million draw shots, that if I am shooting straight at an object ball, I will get maximum effect by keeping my cue level and hitting low on the cue ball and following through. But what do I know. I'm not a physicist, I just play the game. :wink:
And play you do!