Help, White Rhino--brown spots and twisting

I wouldn't normally double post here and in my journal but i'm kinda stressed about this....these three girls are all looking like they're experiencing some kind of deficiency or something...saturday they went on only water, sunday they got 570 ppm (about 1/2 strength for this week---was told wr doesn't like full strength) and today i gave em 950 (about 3/4) FF trio w/ microbe brew but noticed these spots and flushed impulsively--probably bad idea. the leaves with spots are getting crispy and twisted...cal deficiency? mag deficiency? phosphate? what can i do here?

43 people and no one knows a thing?...im transplanting to soil asap then...until i have better environs for hempy plus money to spare on additives like cal/mag and a good pH/EC/TDS meter i'm sticking to soil