You say the FF trio, I assume you mean Grow Big, Big Bloom, and Tiger Bloom. Big Bloom is organic, and used throughout the grow, and you mix that and Grow Big together in the same bucket(with water, never ever mix nutes alone,always mix in water) for vegging, and then you switch to Big Bloom and Tiger Bloom together during flower. No need to mix them seperately. FF has another "trio pack" which is the 3 flowering additives, or finishers some people call em'. They are Open Seseme, Beastie Bloomz, and Cha Ching. They are only used during flowering. Remember, if you use the flowering trio, nevr feed all the way to harvest like their guide says....cut the nutes off 2 weeks before harvest and flush with clean water only. As far as your amounts to use, the program guide they give you is pretty safe, I've never had issues with burning or anything, using the recommended dosage, even in buckets. I don't use all their products anymore, because I've gone 100% organic, but I used them for quite a while and always had good results. Good Luck!!