1Tbsp Dr. Earth 4-6-3 top-dressed, massaged in, and watered down with 1 quart of pH 5.8 de-chlorinated, carbon filtered water.
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