Is your pool exposed to sunlight? Does it have a cover? If you keep the pool uncovered during the day and exposed to sunlight then that should help get rid of the CCs. You've got enough chlorine to achieve breakpoint, but your CCs are probably not simple chloramines. They might be chlorine combined with more complex organic compounds that are harder to get rid of, but usually sunlight works well for those.

You'll know if your pool is exposed to enough sunlight if your FC level drops significantly during the day (up to half).

Richard