If they are hungry and ph is off.....it doesn't matter WHAT you pour in there because they simply won't be able to absorb it. Coco has its own issues so I don't use it.....the less hassle the better and I consider coco a hassle. (sorry for the mini rant there...:jointsmile

If transplaning them into something larger doesn't work....then i'd take you straight back to lockout. I do hydro myself and something about your plants says abnormal ph to me....but that's just my guess.

Good luck.