I wish I had answers to your questions. I had grown a Tray of ? seeds left over and tried to read up on everything. The more I found out the less I knew. I didnt have a ph tester but I used some compost and bag of pre-fertilized ez-grow soil. All I had was floros and not much light but I did germinate by hand ( tray ) and hand plant carefully in soil. That way no transplanting later. I dont know if this is a good or bad way but it worked for me. I had 8-10 tall purple plants no buds or anyidea of what to do next.
Then I had surgery and was kept upstairs and unable to water. I had worries about having plants at that time and sadly they all died. They were all good looking and fairly healthy. I did notice yellowing on the edge of the leaves at a time and I have read that is too much nutrients or burn. But all of my knowledge is mostly painstakingly slow guesswork. I wish I had some difinitive answers for you.

I just wanted to post and yap a bit so you know that If I had the answers you seek I would spread the info.

Your plants look awesome. Strong green beautiful. Sniff... it brings tears to me eyes.

peace
brotherbud