To the bolded comment above...:
If I you mean to minimize a long shot by focusing instead on a shorter section of the aim line (sight line?). Then yes, this is something I already do when the OB isn't in full view. This is a throw back from my snooker days for me. Same approach when jacked up for whatever reason. I think they may have been mentioned earlier in the thread. It may go without saying but the longer you can make this 'shortened' aim line the more you can count on it's accuracy.
You got my drift, on the bolded part.
The bit about your confidence was noted in the first reading.
My comment was based on a reminder, to me once, that there are typically hundreds of views of these threads.
Players of lesser talent, at the moment, may wonder how to get to the level you mentioned.
That was my target audience.
There are other ways to ratchet up confidence, not mentioned.
Reference lines can also be used.
An adaptation of an idea I got from golfer Jack Nicklaus is one.
To find an angle, start from a known angle.
If that angle is an overcut or undercut, choose a second known angle on the opposite side of the pocket.
Now start a process of altering the angle slightly from both perspectives, inching the new freshly calculated reference lines ever closer to the desired angle.
Once found compare that to your normal aim line using your normal methods.
Having two different ways that arrive at the same line, raises certainty and with it confidence.
I felt like your "god I hope this works" comment found a larger empathic audience than what you may have thought
During my reading of the comments a picture of snooker player, Mark Williams came to mind.
He was playing a table length, very thin skim off the rack, for safety.
A replay showed he played the shot perfectly, one handed, with his eyes closed.
Once aligned, there is no need to look at either ball, and as a lot of what has been written here has said, trusting in a measured straight stroke is all that is needed.