Here are a few threads that have great info. Hope you don't mind going to a different site!!
https://www.thcfarmer.com/community/threads/vegging-in-uc-not-going-as-expected-or-is-it-ac-low-humidity.69418/
https://www.thcfarmer.com/community/threads/perfect-ph.39118/
This new graph shows that hydroponics works better with pH of 5.2-5.5. That's where clacium and mg and everything else get taken up the most. At 5.8 there's a bottle neck and then after 5.8 a lot of micros are harder to absorb.