Hey Tommy, about kiln dried woods;
Wood is hygroscopic and that is that. It will always respond to relative humidity regardless of how it was "dried". Kiln drying is a process that allow wood to be dried to a usable moisture content as quickly as possible, nothing more. Air drying, rule of thumb is at least 1 year/inch of thickness.
In my experience air dried wood is mostly free of internal stresses and kiln dried wood is not. I've had poorly kiln dried wood that was done poorly that was essentially unusable. Given the choice I would always pick air dried over kiln dried. It looks better, it smells better, it is more stable, it machines better too. Compare air dried walnut to kiln dried walnut, the difference is clear and astonishing.
In case you are out of rabbit holes the USDA is a tremendous data source about wood and wood processing.
Cheers.
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