id bring the ph down to 5.6-5.8

as far as nutes go, if your plants are handling it why change it is my rule of thumb,

when i first start plants in any hydro system i dont go above 400ppm, then i increase the ppm by 200 every week till it hits 1400 then i tweak it with big bug some more till i get a extreamly slight burn in the tips of leaves (usually around 1500-1600 then i let it sit ther foor the morjority of the flowering cycle till week 5 - 6 then i bring it back on down until im usign plain ol phed water

hope that helps , i know some of m y methods are unorthodox to most but hey it h as worked extreamly well for me.

if you have any mroe ? jsut ask