Lots of action this week, and not necessarily the good kind.
Seeing no changes to the yellowing of the leafs, I decided to do a bit of flushing to try and get a sense of what the soil is like. Seeing the leaf colors and pattern, I hypothesized that Cal/Mag probably wasn't being absorbed.
After measuring the runoff, I noticed that there's a lot of salt buildup AND the soil is acidic (runoff was at 5.5 pH). I decided to flush with higher pH to try and drive soil pH up while lowering the salt buildup. I managed to raise the runoff pH to reasonable levels (6.14 pH) and I observed that the ppm was starting to lower.
I tried feeding the plant at the end of the week, hopefully to get a balance of nutrients at correct pH levels for the plant to bounce back.
I also changed the fans used to circulate the air inside the tent, that has eliminated a lot of the hot spots I was observing during the heat waves.
Next week, I'll keep feeding with a slightly elevated pH (~6.2) with lots of runoff to keep working against the high soil pH/ppm. If all goes well, I'll be topping the plant and try to grow it a bit horizontally.