this is the shot im talking about.
Low brings the cue ball back and left widens the angle. I don't see why you would want to widen the angle coming back, you are trying to go across more than back. Plain stun would work but you have to hit harder then you want to get to the rail and across. Low helps get to the rail but you are still hitting pretty firm.
Scott and Fran have it right, don't draw at all, go forward with a little running English (right). Experiment with speed, high, and right to find the easiest combination for you. The running English is going to make the shot harder but speeds up the cue ball so you can hit softer and that makes the pocket play bigger (trade off).
Deciding to go low or high changes with distance to the object ball, distance the object ball is from the pocket, and how much angle you have. If you are close to the object ball and have pretty good angle the draw doesn't wear off as much and it is easier to get to the rail so you can use draw or stun without having to hit so hard. Draw is attractive if the object ball is a long way from the pocket. As the object ball gets closer to the pocket, and/or your angle lessens and the cue ball is farther from the object ball, the better going forward looks.