i know you weren't asking me but i reuse soil as well, I doubt thats the issue. Are you doing no-till? or breaking up the soil between runs? Either way unless you added much more of something like EWC which retains moisture, id say this is a problem of poor drainage from the start. A whole lot of bagged soils need a bit more aeration drainage media like perlite or rice hulls or lava rocks or whatever you choose.
Also i just noticed this, you are running 2 humidifiers in your space for a couple plants? thats gonna contribute greatly to your soil retaining moisture.
Well my ambient rH is on point, but I am a little concerned with them being so close and surrounding it (not sure if it's raising rH directly around the pot). My only other option is to run them outside from the lung room (which I do in flower), but my rH doesn't get quite where I want it that way and it causes a portion of my living space to have a really high rH.
Considering it is a breathable fabric pot (/w living soil liner) I probably should be more concerned.
My ultrasonic Humidifer recently died on my so I've had to resort to running 2 cool mist humidifiers. The ideal Humidifer for me would be something I could run from the lung room but hose/duct the moisture directly into my grow closet.
I put a hole through my drywall for my inline in order to convert my closet into a grow space. I'm always concerned on details involving air ventilation/circulation since its not a tent designed to grow in but I feel any concerns I have there are minor...
It's actually funny that you mentioned that about the Humidifers because that is totally a detail I would typically obsess about but people keep telling me I'm focusing on too many details.
I should remove 1 or both and see if it improves as that is the problem plant which is surrounded by the cool mist.