Hola,
I'm quite sure tsp-tbls/gal is per gallon of water, not per gal of medium. At least that is how I read it. As far as that chart, I've been using Fox Farm (in soil indoors) for years and have never run across it. I use Grow Big as directed on bottle for every watering (1 tsp/gal) from the day the clones (still in rockwool) go into soil until 5-7 days into 12/12. Thats right around when you'll see first sings of flowering. I then feed w/Tiger and Big Bloom (Big Bloom as directed or more-Tiger Bloom 2 tsp/gal) every watering up until last week or so. I've always discontinued using GB after flowering starts, but due to some info I've read recently, I'm gonna try using adding a teaspoon or so into the mix like once a week or so during budding (next time). I don't think you can burn em up w/ the Big Bloom, but be careful w/ the others. If you're obsessed as I am with your grows you'll notice anything amiss with a quickness. If they show any signs of burn give em nothin but water next time and cut back a little the time after. After a while you'll get in tune w/your girls and "feel what they "feel". Keep in mind Cannabis plants cant process the nutes if the PH is discombobulated and or if ventillation is poor. Also when using ferts, it is imperative to flush. I usually do this somtime around the fifth week of 12/12. So far I've never killed anything and have been more than happy with yeild and potency.
Good Luck and "Goddess Bless This Doomed Nation"