No experience with Ebb&flow or DWC, but I do know you better keep an eye on the roots and look for new white shoots, the browned out black roots are dead dying soon rotting so I'd try and clean em up and maybe carefully foliar feed your plant a little and observe.
It comes down to your priorities really, your plant should be considered CRITICAL in the ER now is NOT the time to over correct and cause another issue, ph right now is critical, ventilation, light and temperature as we'll if your capable of dialing these things in now is the time, good luck!