Man oh man, Rooster, when are you going to simplify your life and go Dutch bucket hydro bro?
You're doing WAY too much math (and in my view ANY math is way too much!)
The problem with soil is, well, everything.
I top off the res, splash a couple splashes of nutes and leave for a week.
No bugs, no guessing, no hassles, no worries, no mess...No shit!
I would love to see what you could achieve with a hydro setup...more time off if nothing else, eh? I'm always here for ya if you ever want to try it. My whole 9-bucket setup, including plumbing, was built using less than $100 worth of stuff.
Peace, Hyena