That C-19 sure looks sticky. While looking at these I thought about the Chocolate Rain I've been running lately. I started to go through some old seeds. Some I popped recently were 11 years old.
They just got watered right before the pic. They wilt everytime the lights go out then perk back up when the lights come on.
Im running gh micro and gh bloom (lucas formula). Having all kinds of ph problems too. Doing perlite and almost certain that the ph is rising between feedings Stuff looks like a rookie is growing it but the c19 is straight fire. It's c99 x with candyland. Sadly I lost the candyland after I did the cross.
Have you thought about switching? Cutting edge solutions has a great line up in my opinion. Made the switch and totally happy. The mag Amp abd plant Amp (cal mag 2 parter) is kinda expensive but it works. Plus they have a great team behind them that you can actually call, cuz its basically family ran company still even though they gaining market share
Also, ph rising is kinda of a good thing, shows they eating for most part, but I see the issue you talking about....which isn't normal. If you get bored, drop a bill at store on their line and do side by side, you may never buy gh again. I've tried numerous, still keep going back to ces.