How about calibrating your hygrometer and then use that to set the humidifier?
Many RH sensors (Pulse, AC Infinity, Govee, AcuRite, Inkbird, etc.) are spec'd to 3%± so, without calibration, it's a real WAG as to which one is "right".
Even after they're cal'd, the update frequency of the devices may be different so if your environment is not stable, you can be gettng accurate values but they might look wrong because of the update interval. I hit that with my 2' x 4' tent - the numbers were all good but the AC Infinity reports every second vs, say, an AcuRite which updates every minute (IIRC).