Regarding the first bold section. This sounds like the HAMB method, especially the part about fine tuning.
I am describing how first came to understand the perceptions. You are a perfect example. Try as I may to explain everything to you, I don't think you will be effective with the system until you put a little time in at the table and hit balls with it. As for fine tuning, that is always happening as I use the system. I think that is true for any aspect of pool.
Regarding the second bold section. In your other reply to me you said that you are able to achieve two different shot angles with the same perception (as in the 5 shot video) because your eyes are essentially tricked into finding the correct line because of the rail locations on a 2x1 table (you didn't use the word "tricked" but I think that word conveys the same thing you were saying). But then with the curtain shots you (and Stan in the past) say that the rails are not necessary to see, as long as you have a general idea of what pocket you want to shoot at.
"trick" isn't the right word, it is just how our perception already works. As Stan states it, "something that was never meant to be". Hal basically figured out that there is perceptual information at the table, such that we can harness this information to pocket balls, and in a very natural way. As for the curtain shots, I'm pretty sure you have to be able to see enough rails to orient yourself on the table. I never tried to cover ALL the rails except the one under my arm, but I'm going to guess that won't work. As we know, this is never a situation we have in a game. It is just meant to demonstrate the use of perception.
So this is an inconsistency. To restate, let's take two situations. First, you have a 30 degree cut shot and you can see the rails. So you get your perception (ETA? it doesn't really matter for this discussion) and make the shot. Then we reset the balls so that it is now a 33 degree cut. But, as you say, the rails fool our eyes so that now the same ETA perception is going to give us a 33 degree cut successfully. In the second situation we have a curtain up near the two balls so that you don't see any rails other than what is below your shooting arm. If we shoot the same 30 and then 33 degree shots again with ETA, how are we able to do this without those rails fooling our eyes into the correct position?
When you move the balls to a 33 degree cut, this is a different shot, and when we orient ourselves behind the CB/OB with ETA/CTE, the result is a slightly different alignment. I already answered the curtain question above.