Oh my gosh! This might actually be working!!! This is great news. 1/4 teaspoon of 6% bleach in 2 gallons would normally raise the FC by 10 ppm so I'm not sure what's consuming so much chlorine after you start measuring it. The reaction with the remaining hydrogen peroxide should be fast which explains the first couple of hours of readings, but after that I would have expected chlorine addition at 9 PM to register more like 12.5 ppm at 10 PM. At least you aren't getting CC readings.