Get rid of the tnb down for hydro. I used it and it was pure shit. Absolute shit. It was given to me free and all it did was cost me a ton of money in having frequent res changes and h202 thinking I had an infection, ditched the tnb and used GHE down and problem solved overnight. Do not use anything considered organic for hydro, no matter what the label says. It's just not stable. I think this maybe causing you some issues keeping ph dialed in. I would also immediately start a light feed at maybe 25% of recommended strength and move up from there. She looks hungry.