I really don't get much of what you're saying to be honest. But here goes. 0
I see you're already giving high bloom.
Really, it's not needed, any change in NPK until you're just leaving pre flower..as it uses a lot of N in pre flower
.probably more so, depending on the foliage growth of your plant going into pre flower and during. So, you actually should have a grow Npk.Or something more on a 3-1-3 ratio. You'll get through it o reckon.
As for your space. You're going to have so many possible issues. Its way too crowed for hydros imao..
I really would consider throwing a net over that..as you said. They're all pretty even. Any that stretch mad can be pult down.