ktrepal,
20 something years ago when I was an aspiring wanabe practicing 6 hours per day, I thought the bees knees was to get wrist, elbow and shoulder in a perfect line.
To do so requires extreme hip contortions or side on standing, which requires severe neck twisting to get face on to the shot, unless one has very narrow shoulders.
Over time I realized that seeing the line is far more crucial than forcing the body into a position where the head and eyes are not well positioned to visualize the line of shot.
So imho, focus on that, and train yourself to stroke pretty straight from a slightly unplaned set up... which most pros have anyway. It's simply a matter of coordination to make a pretty straight stroke by timing which muscles come into play to correct an imperfect planar wrist, elbow and shoulder alignment.
Keep in mind that if the elbow wrist line is vertical, but the shoulder is right of the cue, then a pure bicep contraction will not move the cue along the direction it is pointed to. It will move toward your shoulder, not to the tip of the cue as many presume.
imho, the biggest virus players have is thinking that most their problems are going on behind them. It's a paranoid tendency. 95% of their problems are right in front of them... their bridge placement primarily.
Colin