20 ppm works just fine 30 ppm is only a bit better.
Ok, since you are still losing FC pretty fast, I gonna suggest a target of 12 ppm instead of 10 in the chart.
As soon as the sun is off the pool this evening, I would test and then dose enough to get your FC up to 12 ppm....regardless of cc's...I wouldn't even test for them anymore until the end.
Get up as early as your body will allow, test and bring the FC up to 12 ppm again.
Have a good day at work.
Tomorrow evening, repeat the process and so forth until it clears.
Your issue with the FAS/DPD FC test was, I believe, you are not completing the test. As you are drop counting and leaqding up to the final drops, the solution will "flash" clear or turn clear for just a few seconds and then back to pink.
Keep counting drops until the pink disappears and stays gone for at least 30 seconds....that's your FC test result.
Don't worry if it doesn't perform exactly as you expect. There's enough "cushion" in the values we give you you won't hurt your pool unless you do something arbitrary.
Report all three test results and dosages once daily so we can track your progress.