drooping leaves

need some advice, here's the problem---week 3 flowering-e.c.160--p.h.5.7--nutes.temp76 --some of my older bottom leaves are wilting-some weird leaf twisting good color just looks like the water can't pump up the leaves-no yellowing any ideas?? hydro with g.h. nutes.

at that ph Im gonna guess hydro-and those gh nutes have a history of salt build up.
check out this link:
http://www.drugs-forum.com/growfaq/1534.htm

if it was the newer growth on top kind of wilting before lights out that is one thing. lower ones, well they r gonna wilt-twisting is usually p deficiency starting.
wanna keep ur yellowing controlled until later in flowering before harvest to a degree.