I hope this doesn't bring out the Hatfields and McCoys...I agree that at some point all the aiming needs to be done unconsciously....and at the end of the day (and many discussions) aiming a pool shot is most similar to aiming a RIFLE....I believe after reading all of your points and questions in this forum that the main question should be NOT how we pros aim, but, instead, what are our "SIGHTS" and "How do we {consistently} line our Body & Eyes from the Cue Ball to the Object Ball"?....when you start to understand the answers to THESE questions you will be very close to doing it yourself....until then, you're going to be free to ponder 40 different "aiming systems".....and trying to understand if they "work" or don't "work"....in the mean time ask yourself this question: "How much more effective is my ball pocketing ability?" .....and "What are my 'sights' that I'm currently using?"
Gene Albrecht is too shy to blow his own horn here, so I'll take it upon myself to mention the Perfect Aim stuff he teaches (which I know very little about). Are you familiar with it? Are there similarities?
pj
chgo