Yeah I think everyones eyes would have over looked and just read what I said properly if I didn't point it out
Looking beastly bushy now. It should slow down in stretch once it hits flowering stage fully which could be day 30 or later, sadly veg stage it can get carried away but I think if you forced it to flower stage now you would miss out on a larger yeild. If you had serperate buckets for each strain you maybe be able to control this uneveness by lowering just its veg nutes and not the others but that would be far too difficult to switch now with the screen in play so much now.
Raising your light 3inches this time will encourage stretch from your big girl but, for while you sleep it sounds like the safest option as clfs burn plants on touch.
If you feel it and the other 2 have enough bud sites you could try start pushing flowering as I did once my one plant was just over shadowing others. the smaller others strains got burns along the way but my main focus was the big girl and her needs. So I guess what I am trying to say is you may have to decide, who and what is more important to you?
Can your veg and bloom nute go in res together? That way over the next week you could ease off one and onto the other. Can you get some shots of the smaller girls with a light under the scrog so we can get a read on the point their at?
Under 20days onto full bloom nutes for the AA seems awfully young. Hope Vick can pop in with a tip or 2 as I grow Hydro differently.
I been wacked all day on medicine so hope I was of some insight..