Not sure what type of humidifier that is but you may need a rotary one to get lower. There’s a technology connections video on them. They essentially are silica that’s constantly dis/recharging. They’re very energy inefficient but don’t have the same performance limits as compressor based systems.

I got one earmarked for exactly this before I moved. They’re simple enough I was planning gutting it and adding smarts using ESPHome. But moisture hasn’t been an issue for me so the project is a low priority.