sounds to me like ur plant is haveing trouble uptaking the water u give it. I am vby no means qualified to answer this Q, but i have a couple of sudgestions that cannot hurt ur plants that u could try.

I think maybee ur roots are possibly bound by the looks of ur pot size. U could try to transplant to bigger pots. U could also try ur airate ur soil, which will bring more O to ur roots, to do this poke some holes deep into the soil using a pecil or somthing, also u can scratch up the top layer of ur soil with ur fingers, emphasizing more air to get down into ur soil. Also it could be nute lock out maybe due to a Ph prob. and if so i cannot help on that one my friend.

U need to seek help from a MJ veteran like Stinky Attic, or pycho 4 Bud or the Image Reaper.

So calling all Vets. ....... where u guys at, i knko ur somewhere out there.