That stuff is fine. All of it is fine. Most guys switch to dry salt once they get going. I'm still finishing my bottles as well
The deal is they are pro's and can get the plants to use all that food.
Most of us can't, we don't have the environment nailed down.
The other thing is, can your plant read a calendar? what wk are they actually? It just takes time and experience to learn it, like when it first flowers, looks crazy. Go light on feed, I smoked mine feeding too much in coco. Feed just as much ppm as you need, even if it's .6 ec.
PH coco around 6. I do 5.8 - 6.1, anywhere in there.
I used to mix in a 5 gal bucket and add all that to 2x as much water as they say, and then dilute it further if needed. That way the ratios are right between the nutes and you are just adjusting the overall strength with water.
If you do the maxibloom thing, heat some water and it dissolves really quick.