I used to have a lot of trouble with a certain back cut shot, not unlike a Mosconi break shot angle in 14.1 but a little bit further up the table. It got so bad, that I had trouble even cinching the shot with low and outside, and other tip position would often not even come close. I told this to a very good instructor. He said that's easy to fix, all you need is to hit it with a certain tip position. He'd describe it to me, it was about the midway point between maximum draw and center. I'd point my tip to the cueball, and he'd say "a little lower", "a little higher" until I found the position to his satisfaction, which was an extremely precise point. After that, he set up the shot and I nailed it EVERY time. The reason was, of course, that I had allready decided on the exact cue tip position, even before going down over the shot. This both took away the anxiety and fear of missing the shot, as well as freed up the subconscious to aim the ball correctly while the conscious mind was focusing on getting the tip position right. The secret tip position was not secret at all. After this I nailed the shot with every tip position you could think of. The instructor naturally intended me to understand this.
