I also use the FFOF soil and it has nutes in it. You could go for weeks without adding nutes, so I don't worry to much. I re-pot before flower and start adding nutes then.
My Pre-98 Bubba Kush plants are lush green, never yellow. If I saw a problem I would add more fertilizer.
So to answer your question, start out at half strength, until you get the hang of it.
I grow in promix hp not ffof and I just switched to House & Garden but for almost two years I used the whole FF line and I liked it pretty well. You'll go broke buying Big Bloom though as the dilution ratio is two tbs per gallon and it's also the ph buffer so not using it really isn't an option. It grows frosty, good-tasting weed and it's usually easy to find at any hydro store.
Used a few lines.....have always used FF. It has good prices compared to others and it produces quality weed and still gives you great yields. You can get better yields with other lines, but IMO the quality goes down usually.
Follow the chart they provide with three exceptions....
Start the Tiger Bloom out at 1 tsp/gal and work up to 1.5 tsp/gal. Haven't found more than a few strains that will take that at 2 tsp/gal.
I never use 3 tsp/gal like they have for the last veg feeding. 1-2 tsp/gal is all you will ever need.
Big Bloom is probably what gets the herb to have amazing flavor and aroma. I use it at 1oz/gal the entire way through.....veg and flower. Buy it in the 2.5 gallon container and you save.
I use grow big, tiger bloom and big bloom last year on my 1st grow and
the results were top notch.
I also used their 3 finishing powders for blooming---> open sesame, beastie bloomz and cha-ching.
I won't use cha-ching for finishing anymo because its loaded with nitrogen.
I wondered why my plants stayed so green till the end