Mmmm... that's interesting. Maybe the very light pink that persists is some other interference either from some strange CC or from the hydrogen peroxide. Tell you what...why don't you add chlorine to the bucket until you measure a consistent FC level and then we'll see if the CC still has this weirdness. I don't think the CC is actually very high at all -- it's just got some strange test interference.
By the way, at least the CC seems to be dropping in the pool itself. That is consistent with another report where it took about 2 months for the CC to go away. So with the percarbonate approach we're really looking at seeing if it can accelerate the process. Let us know what happens in the bucket after you add the chlorine to it.
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