I have to argue that this is one that should be individualized by the player** (do I have to note all the many BIZARRE variations of some of the best players who ever played)?
I have always paused long and hard at the CB (tip close to the CB). That always came naturally to me--you want to "feel" exactly where you want to finish (the last point you have meaningful control--an instant before you hit the CB). After that, it's necessary to have a "deliberate" backstroke--so that you "feel" the movement that's necessary to GET TO the final position.
Rather than a specific recipe, what's necessary is being DELIBERATE: having a full awareness of all the motions and spatial relationships. I'll agree that it's also necessary to "stop" after the hit--if you want to LEARN what you've done, which you should ALWAYS want to do on each shot.
For me personally, I have the notion that I will "forget" where I want to be, and what the backstroke felt like (i.e., the movement I want to reverse, in order to hit where I want), if I "pause" at the end of the backstroke.
But that's just my individual feeling about myself and controlling my own movements--I admit I've never tried a pause at the end of the backstroke, so I don't know if it could be useful to me or not. OTOH, though, I could not IMAGINE not pausing near the CB, and I can't picture any strong player who I've NOT seen pause there.
**EDIT: Experts on the cognitive aspects of performance HAVE noted that some things are true for ALL people--right alongside the observation that there ARE personal variations in cognitive approach between people, and that it never seems to work to try to mess with them TOO much. The performance world generally demonstrates that the very GREATEST performers very often (virtually always) had idiosyncrasies in their form or approach. One might say those idiosyncrasies are evidence of the meeting of personality and performance--such players are putting their WHOLE MIND into their performance, and it's that which makes them great...and not slavish devotion to some arbitrary "form."
Second edit: I've just read a wonderful article on scientific research, and the problem of error in research--most especially medical research. If you like to think of yourself as a thoughtful person who likes to KNOW what they're talking about (and the problems associated with that endeavor), then I recommend you
read it.