If you look at my threads in hydro it will give you an idea about ppm and ph in flower. You just have to look for it.
generally the bottle directions work. you won't have any problems, if that is all you feed them...well maybe a slight deficiency here and there. but you can address that. ph is most important to keep consistent at 5.8...learning to adjust ph (as Z mentioned above) also allows you control over which elements are most available to your plants.

lastly...growing is a trial and error talent. you must go thru trials to make errors and learn. Nutrienbts are a perfect example. Good luck. We hope you find this info helpful. lw