dont use the FF schedule. It's only a guideline.
I've been using the FF trio for awhile, and when I first used it I went by the FF schedule and ran into many issues. Make your own schedule based on the plant's response to the nutes.
Grow big = rich in N, use during entire veg stage. 15ml per gallon 2x a week.
Big bloom = Bud site booster. Packed full of goodies to get bud sites developing. This should be used at the first sign of flower, otherwords the instant they show sex, and should be used throughout the entire flowering period. FF recommends 15-20ml per gallon. The first 2 weeks of flower you'll be using both grow big and big bloom combined. I personally do 10ml of each in a gallon. Once I stop using grow big and swap it out with tiger bloom, I increase big bloom dosage from 10ml to 15ml.
Tiger Bloom = Flower density and resin production. Use tiger bloom in combination with big bloom throughout the rest of the grow when buds begin to develop. Usually this is about 2 weeks into flower, when you'll stop using grow big. 10ml per gallon is plenty.