Hello. I have been using just the basic 3, Big Bloom, Grow Big and Tiger Bloom as with the additions of Open Sesame, Beastie Bloomz and Cha-Ching. I always use pH 6.5 water throughout the entire grow.
For the 1st 8 weeks of vegging state I only use pH 6.5 water (1Gal) with just 1 TBSP of Big Bloom and 2 TSP Grow Big every other watering. Since FFOF does not have a lot of calcium in it, this is the reason for using Cal-Mag which can be used at every watering but I use it every other watering (I done it a few times every watering but did not want to "overdo" it, even though the bottle says it's safe) That's it.
Transition week #9 when I flip to flower I use the same as above mix and ADD 2 TSP of Tiger Bloom AND 1/4 TSP of Open Sesame (yes, you can still add Cal-Mag to this as well).
Flowering: As you can see on their schedule they show mixing all 3 or 4 of the stuff to use. I myself stop the Grow Big (from transition week) until about the 4th week into flower and only this 1 time as you want less Nitrogen towards the end of flower (this has been a topic still not clear as why they would recommend higher nitrogen that is in Cha-Ching towards the end?) I only use Big Bloom with just 1/4 TSP of Open Sesame by itself for the 3 feedings, then I switch to Big Bloom and 1/4 TSP of Beastie Bloomz (by itself) for 2 feedings, then Big Bloom and 1/4 TSP Cha-Ching for the final 2 -3 feedings (I never got to the 3rd or 4th one because you have to allow for flushing so you have to adjust these feedings the very last weeks of flowering after using Beastie Bloomz. Then I flush until my PPM is down to around 200-250, let dry, then ready for harvest. My last grow was the bomb using this as compared to using it the way "they recommend" during my previous grows that were Good, but this was THE BEST.
Hope this helps.