The shelf on this:
CPAP Dry Mouth and Mouth Breathing: How to Stop It Tonight — dry mouth and mouth breathing, with the full set of fixes.
CPAP Mask Types and Fit: Nasal, Pillow, and Full-Face Compared — what each mask class does well and badly.
CPAP Nasal Congestion and Stuffy Nose: Causes and Fixes — for step 1 above, which is the step most people skip.
Nothing on SomniTalk is medical advice. Talk to your own clinician before changing therapy.