Seeing burned tips makes me feed it differently, 2 days with fulls set of nutrients, 2 days with Cannazym only.
I pruned them a bit more, not sure if it was a good idea but those little branches didn't develop a lot during this time.
On day 4 of the week, after HSO's comment on a weekly report, I've measured runoff and it was insane! 3k-5k ppm
Flushed them all so that runoff was around 800 ppm, and watered them with Cannazym only (PH around 6.1, EC 440 ppm).
Also moved them around a bit
Most likely the reason for conductivity going so high was that I removed the pots from platforms at some point and old runoff was probably soaking in.