There are additional humidity options too; system one humidification, humidifier, humidity level, tube temperature. These might be in the setup menu and not the patient menu.
Do you have a copy of the clinician manual? And would you feel comfortable changing setting there while still under the watchful eye of your DME?
**I don't have my machine yet; but have been trying to do as much research as I can on the PRS1 560 Auto and sleep apnea in general after getting Dx'd a couple weeks ago. Hopefully someone with actual experience will be able to help you out soon.