Hi, I've been using the techniques for the last year and have been very happy. Last year my CYA was around 40 at closing. This year after startup it is stone cold zero, checked several times.
I used some trichor shock at startup to add a bit of cya, but otherwise have been using the standard care techniques. The cya test is the tiniest bit milky with the tube full (? cya of 5-10)
The pool gets about 3 hours of direct sunlight. And at least for now seems to only lose about 1-2 of FC each day.
Why not leave the cya super low? It would free me up to occasionally use chlorine pucks when i'm out of town etc.