Durban poison and sour diesel, looking for opinions on how they are looking and when to switch to flower.

Ive got my first hydro grow going, and looking for feedback on how these are looking And when to switch to 12/12. Also my first SCROG and I think it’s going well. I’m taking about 8-10 fan leaves off the lower areas of each plant a day as well as ones blocking light on top of the screen. The screen is only 5” above the top of the pot. i have a journal, but here’s the basics:
GH Flora 3 part nutes with CalMag and H2O2
HLG600 R Spec and a few side lights
Drip system that recirculates, watering 50/50 coco/perlite, water added daily and changed now every 3 days, girls are thirsty!
Ph kept about 5.8, RO water keeps going to 6.5, using citric acid to keep down, takes about 3 tsp a day.
PPM of nutes starts about 1000 in morning, and is down to 680 or so by early evening when I add more nutes, water.
I did just take clones today, I think I’m ready to flip, opinions?
Thanks for all your input, I really do appreciate everyone here that truly helps each other out.

Durban Poison and Sour Diesel in hydro, you're talking my language! I found Durban a bitch to grow as it gets so tall. Your SCROG will stop that though. Looks real good for a first hydro grow. Nice light, PH is fine. RO water will move around a bit for PH as there's no natural carbonates in it. So you add nutes every day when they drop from 1000 PPM to 680 and you change the water every 3 days. That seems like a lot of work and it's a bit dangerous to add nutes every day (some nutes get taken up fast others don't, the ones that don't build up when you add nutes every day). A bigger reservoir would help a lot with that but the plants look good so it's working.
Since you took clones already I think you're ready to flip. You could wait a bit and fill your screen more if you like but that Durban will start taking all the space. I use 24-36 hours of dark at the flip.

Thanks for the feedback, going to flip tomorrow. I’ve been changing the res every 4-5 days but the girls are drinking more and more, so every three is going to happen soon.