In fact the cut angle on the 2 ball is 75 degrees. This is easy to measure with a protractor or the drawing system I use for these diagrams. Here is the correct way to line the shot up on the 2 ball. Instead of sending the red dot on the cue ball at the red dot on the object ball (nearest to farthest), you should send the green dot on the cue ball towards the red dot on the 2 ball.
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Line A and line B are parallel and go through the centers of their respective balls. Sending green to red is the same system shown in Mosconi's second book and in Byrne, and in .... It sends contact point towards contact point.
Let's do a thought experiment. This is much easier than doing a real experiment especially since some of us don't have access to tables right now.
Consider the shot on the 2 ball. Move the cue ball and the 2 ball together away from the pocket along the A and B lines, moving each object ball the same amount. The cut angle will remain the same -- 75 degrees. If you don't believe this, make a drawing and measure it.
A better way to do the thought experiment which is much harder to do on the real table is to just move the pocket away along the A line without moving either ball. If you do that instead, I hope it is immediately clear to you that the cut angle doesn't change. Please get comfortable with the fact that the cut angle doesn't change and Mosconi's system still tells you to drive the green dot at the red dot before reading on.
Good. Mosconi's system is staying constant for a constant cut angle (but with increasing distance to the pocket) but what is happening to the nearest-to-farthest system? As the pocket gets farther away, the red dot on the cue ball will move around the cue ball towards the green dot. If you don't believe this, draw out a diagram with a few new locations of the pocket along the A line.
This means that as the pocket gets farther away, the nearest-to-farthest system gives less error on the cut angle. Unfortunately, the pocket is farther away, so you likely miss the shot by more and more distance even though the angle is getting better. When the pocket is infinitely far away, the two systems give the same, correct answer. Such a large table is not practical.