Awesome bro..Ph is key right now and always trust me. It goes hand in hand with overnuting and feeding..
5.7-5.9 constant man u will have a lil fluctuation between the numbers but try to find the happy medium of 5.8 and they will love u for it. What was ur ph when u checked it on 3 and 4?
The trick tho i think is consistency of water condition's meaning no major fluctuation or swings in ph balance and ReZ temps and ur plants will adapt i believe..
Also, That all goes Hand in hand with lighting schedule..Do not continue to switch up ur lighting..If ur going to grow 24/7 then do it from start..Same as 18/6 and 12/12 etc..I believe uniform grow conditions without fluctuations is also the key.
For the record ive never done 24/7 although its interesting and ill probably do an experiment on it but ive stuck to a solid consistent 18/6 in veg and then an overnight sudden change to 12/12 to induce flowering..
Consistency i try but its seemed to be the key cause ive been searching for males lately doing all these things cause my female ratio has been to high currently.
Anyways man these are just my ideas that ive learned in my system..Alot of things could alter ur own experiences so deffinetely tweak things a little to work for u bro.
Hope that helps.