Hello,
I know everyone has had different success with certain bottled companies, biobizz, canna, GH. I personally had pretty good luck with fox farms trio, and when i used their recommended amounts my ph was typically pretty close to where it needed to be. However I don't think you can wholly trust any of these "ph perfect" products enough to not check your ph. You might get luck occasionally but not always.
I do think its good to pick 1 company though and try to use their line, versus a little bit of several different ones because then you might get some excesses/ deficiencies because of the products not built to complement and complete each other.