Do you have a pool cover that is dark or opaque? If so, uncover your pool at least part of the day to let sunlight on it as that can help bring down the CC.

I don't know why the FAS-DPD chlorine test isn't giving you clear readings. Though sometimes the water gets a little cloudy during the test, the color transition is usually pretty clean. See this link and click on "Pool/Spa" on the left, select the K-2006 "To Test (Free and Combined Chlorine) using FAS-DPD".

By any chance was your pool converted from a different type of sanitation such as Baquacil/biguanide/PHMB? There may be something in your pool causing interference with the FAS-DPD test.