250f hot oil bath using a small flask to hold the concentrate. Stir while decarbing to ensure even heating. I'd run until the bubble rate drops off radically, definitely not more than 25 minutes total.
I've never had carbon filters alone do the job. Even scrubbing with a seperate filter on exhaust. Halfway into 12/12 and shits getting stinky past the cf.
Other methods of odor control may be required. Perhaps drop a negative ion generator in the exhaust fliter.
I've had great luck using heat mats intended for starting seeds / rooting clones. I set a vac chamber on it and temps peak around 107f film temp. Some newspaper between the chamber and pad will drop temps to desired point. An infrared thermometer is invaluable.
Looks like time over temperature has decarbed your oil making it darker.
Stop when big bubbles are gone, fizzy small bubbles are co2 from decarboxylation.
A GC/MS will by nature decarb your product leaving you unable to differentiate between acetate and decarboxylated forms (THCA vs THC and so on).
A LC/MS will give detailed results.
Add heat.
As air temps drop, RH% rises, given a fixed amount of moisture.
Also, dehumidifiers work less efficiently in cooler temperatures.
Double whammy of suckiness. :/
A tensioned slab with cars and equipment on it would likely present structural loads that would exceed the containers crush limit. I'd highly recommend a properly engineered foundation / basement with hidden access and could be called a "survival bunker", that also makes the diesel generator...