Trying again with these. I've learned a bunch and have incorporated that learning into this grow - I hope.
Nutrients were added to the soil/substrate, in a slightly larger than 5 gallon batch, well blended, and divided across 2ea 3-gallon fabric pots. Room remains for top dressing and topping off as needed. Measurements defined above are per dry gallon of soil/substrate.
I added a cheap Vick's warm air humidifier in front of my oscillating fan, halfway through the week. Temp/RH much better now... not perfect but as winter approaches, the basement temperature will drop by about 10 degrees (typically) which should improve the VPD in the Basement Grow Zone (BGZ). I've brought BGZ VPD down from 1.7-ish to 1.1 or so.
The four sensors are:
1: BGZ @ eye level
2: BGZ @ canopy
3: BGZ @ knee level
IN: Main Floor Living Space @ waist level
VPD Calculator and Reference:
https://www.omnicalculator.com/biology/vapor-pressure-deficit