Yeah it's too bad the Oasis sequestrant has mysterious ingredients. Oasis is unique to Charlotte, but I'm sure that product is just something they rebrand. Maybe those NJTSRN numbers will show up again somewhere else. In the case of my pool it seems to show some efficacy.
So my limited knowledge thus far tells me there is "good precipitation" of metals combined with sequestrant in the form of debris which can be easily vacuumed out, and "bad precipitation" that is basically just metals forming stubborn liner stains which can't be brushed off. Perhaps the same water chemistry is conducive to both forming? In my case, the precipitation became more substantial after I let the pH float up (about 7.6) and increased the FC (7 - 8). So maybe you have to be on the bleeding edge but with adequate sequestrant (perhaps non-HEDP) to get the "good precipitation", and if you aggressively keep pH and FC low with a more powerful HEDP sequestrant you'll never see it?
So my chlorine demand is down to 4 ppm per day, which is still elevated but manageable.