Red, good to see you here!
Yes, unless one uses an accumulator the duration of each spray needs to be > 3-4Xs longer. In addition to an accumulator/solenoids, gauges... you also need a timer that is accurate < 0.5 seconds. I wasn't willing to add that complexity or expense, especially when my early DIY was growing bigger, faster.
Now, I find I need to check pH/ppms every 2 days in veg, daily in flower
Call Hydro-Research for answers to HW formula v RO, which I use
Can't really tell by that photo, but it appears to be the same stuff. I also use ornamental rock from Dollar store. This I use inside the 3"+ net pots, to add weight and to distribute the roots farther around the net pot. Once they are sufficiently rooted, I drop the whole net pot into a 1 liter AP- minimal stress. Also use ornamental rock as a cap over the Air Pots, which contain the lava rock. I too had plants falling over, but I was using smallest net pots + HPA and the roots would grow towards the spray heads causing the plants to lose balance,
My sat dom clones are considerably shorter than the mother, but with tons of bud sights.