Keep in mind that the cue ball squirts in the exact opposite direction of the tip placement, So, for say 7:30 for the tip placement the ball will squirt along a line from there, 7:30, to 1:30 & for a 10:30 tip placement the ball with squirt along the line from there, 10:30, to 4:30. Since the ball is being squirted into the bed of the table, the actual squirt may be a hair less as it can be absorbed by the table, but the ball can also bounce 'out'. To me there always seems to be a hair less net squirt when using high along with the off center.
Nice point, English. If you want the cueball to stick to the rail, a level cue is very important. Since the nose of the cushion contacts the cueball above it's center, any upward bounce or squirt will cause cueball to ricochet off of the bottom of the cushion nose, forcing it away from the rail - the 'bounce out' mentioned above. Both draw and follow can cause this effect, which is another reason I advocate for shooting away from the cushion with a slight swerve.
If you have to draw this ball, I think the slight swerve (again, only a couple of mm's) and a slow, smooth, maximum draw stroke (much easier with a soft tip) is the best way to go. I would play around to see exactly how low you can hit the CB without miscuing - the softer you can hit your draw shot, the better.
Aaron