The multiplier for the 25ml sample test is 0.2 and 0.5 for the 10ml sample. So... you have 6 ppm FC and 1.4 ppm CC. You may want to use the 10ml sample as you'll go through your reagent pretty fast using the 25ml.
You can lower your pH as Watermom described - your pH test is accurate with FC of 6.
You'll need to get your FC up to shock level as per Ben's Best Guess Chart and keep it there until you have almost no CC and you have less than 1ppm FC loss overnight.