Brassavolas do fine with lower humidity than most other Cattleya alliance plants - or orchids, in general. Lucky choice. The main problem with them is giving enough light to bloom them.
You can dampen roots hanging in the air as soon as they dry out. Most people don't wet them towards evening so they don't sit cold and wet through the night, which some people think invites rot.
The fertilizer dose you're using shouldn't be a problem, but what water are you using? Your utility will have a water quality report available online. Brassavolas prefer total dissolved solids (TDS) under perhaps 400-500 parts per million (ppm.) Some orchids must have even less. Your fertilizer will add some to your water as well. My city water has 800-1200 ppm TDS so I collect rain water, and use reverse osmosis water when that runs out.
I think if you spritz just the exposed roots they will continue to grow a bit.
People sometimes hang some Spanish moss (Tillandsia usneoides) on the exposed roots of orchids to keep the humidity up a little.
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