Hey SB, just wanted to share my experience with you since you often switch nutes around.
On my AWW&TD, using all canna range except Carboload and Cal Mag, when introducing carboload to a big rez mix, EC would drop slowly during the week. Like from 1.8 down to 1.4. No bubbling, but a 500lph powerhead fluming an 80L rez, so even "cleaner" than bubbles. The mix became slightly cloudy and a few days later I was all frustrated fixing what is always rock solid on the mark. Btw, this is using coco nutes and hand fed, so the rez was just sitting tight. Never had this before, maybe a bad batch of the carboload?
The walls of the rez, pump and EC/ph probes started getting a thing layer of crystal formation after a few weeks after introducing itm that was very very very tought to scrub off. It seems the carboload reacted with the salts and percipitated them... well, not really precipitate... agglomerate? lol... Anyway, pH would also skew off mark slowly
Anyway, switched to Boost Accelerator and it saved my crop. The plant burst into production. Almost like if Carboload even slowed her down... yeah, probably a bad batch... But anyway, I too was mixing a strong feed, but the plants were not looking like they were taking it all in. Also a slight clawing while slightly on the pale side.
Just FYI in case you suspect something is off. Next bucket change, I suggest keeping a bit of the mix in a jar off somewhere and test the pH and EC every few days, just to be double sure.
I'm also running a high EC on my AU. Slight tip burn a few days back, but pulled back a notch and they're happy. Was wondering about how hot you like your cal mag and silicon? My base water is ec-0.25, then I "ammend" by adding 0.5ml/L cal mag and 0.5ml/L silicon. This brings me around a total base ec of 0.5-0.6, then I mix up the "food" part - Currently, day 21, EC 1.6-1.7 (base + 1.1 - 1.2). I'll leave cal mag where it is, seems to do the trick every time. But I could increase silicon for enhanced performance.
I was thinking of upp'ing the silicon to around 1ml/L, but doing RDWC I don't know how they will react, and mixing up 75L at a time can be quite costly. Never gone beyond 1ml.
What do you think is a good silicon regime?