For sure, man. I suppose I should have noted my rh in conjunction with temp.
The room was sitting around 80 ambient and the leaf temps were 78 or so with ~1200ppm co2. Just getting this room worked out and started running it without compensating for the dehumidifying effect of a new mini split, and allowing the nighttime dehuey to suck some pots dry.
So the root of the fuckup, I believe, was me pushing the plants like I did in previous rounds when my vpd was in check (leaf temps in the low 80s, rh 70-75). Here's where your point comes in, @Purpletrain, where the plants were taking up more water than fertilizer. To compensate for this I should have ran a lower ec but the ferts I'm using don't really perform unless they're around 1.5-1.7 ec.
So I just dropped back from 12 irrigations to 4, and now to 3 (with increased runoff) which should theoretically lower my medium ec.
I'm starting to look at the controlled environment like mulders chart, everything effects everything.