Fox Farm feeding schedule and additives question?

In my dwc I've decided to use fox farms hydroponic trio but when referring to their schedule they have a few other additives in the mix. Are these necessary or is this an up sell. Ive seen many others with a list of products they use and its a bit confusing.

With that being said are there any nutes that ill need to supplement with the trio.

My big worry is I find that I have a nute deficiency and knowing my schedule conflicts with local hydroponic shop hours that ill be left with a dead plant.

Link to fox farms feed schedule

http://foxfarmfertilizer.com/frontpage/feeding-schedules.html

I use the big three in hydro, I don't buy any other FF products
I do buy;
Mykos and Azos for my veg as biological supplements.
I also add 1 gram Epsom Salts per gallon.

Are those additives you use through the whole growing and flowering cycle?

In My veg I use
big bloom and grow big along with the Mykos and Azos and Epsom Salts.

In flower I use Tiger Bloom and grow big along with Epsom salt