Candy cane

Got my 2 spider farmer SF-1000's at 40% output. Leaves were starting to curl on the one plant and weren't looking too "sharp" on the other. Probably over watering. I'm cutting it back a bit and near the end of the week I think I watered once with some water ph down to 6.2. Correct me if in wrong but the plants absorb nitrogen better at a lower ph range like 6.2 as opposed to absorbing more phosphorus later in flower when you'll be looking more for 6.8. PS Organic nutrients are not the same as synthetic for ph range. July 13th-20th.