Here's something I learned from the IPAT videos that I thought was particularly good, and possibly helpful to you. The exercise is to determine the best angle between your cue and your body.
Some like an open stance, facing directly at the ball with you shoulders perpendicular to the line of the shot. Others prefer a much more closed stance, with the body turned up to 90 degrees away from the line of the shot. Which should you use, given the myriad of choices from one extreme to the other?
Grab a cue and hold it in your shooting hand at the balance point. Let your arm hang loosely at your side, so the stick is parallel to the floor and a little below your waist (depends of the length of your arms). Hold the cue loosely and keep your wrist, elbow and shoulder loose as well. Close your eyes (this is important, don't skip this).
Rotate your arm clockwise and counter clockwise a few times, keeping the arm and grip loose, and keeping the stick parallel to the floor. Stop powering your arm and let it come to rest gently, in whichever orientation is most comfortable.
Open your eyes and look at the angle the cue makes to your body. That is the angle you want to have on every shot. Hold the stick more firmly now, and turn your whole body/stick until the stick is in line with the shot. That's the angle you should have to the table.
Your wrist will be most comfortable in one particular orientation to your arm, but that orientation for you may be different than it is for me. One isn't better than another, but if you try to shoot with a different orientation you'll be fighting your body's natural motions and your stroke will suffer because of it.
Fighting against the body's natural tendencies requires conscious effort, and you don't want that; you want your stroke to be second nature so you can use that brainpower for more important things.
