I prefer Nasal mask but always wake up with air being expelled through my mouth - even when closed ( through the lips.) I briefly tried a chin strapped but felt my head was in a vice . In desperation at 3AM I found some medical tape in the first aid box and used some over my mouth. I still woke with air being pushed through my lips and escaping around the tape.
For some nights I have tried a full face mask. However, when the pressure ramps up to 15 ( from 8) , air escapes around the mask edges. Even when very tight I will get l sleep interrupting leaks with any facial movement. I asked the provider for a larger mask but they gave me the same one back with the expectation to persevere. They also resisted my earlier requests to increase the start up pressure from 4 to 8 because I could not draw enough air, but did bump it up after a few days.
My thoughts are that I should discontinue with this provider and take more control over the process. I figure that there has to be a lot more options out there, however subtle the differences may be. I would welcome anyones thoughts about going down that path as well as any suggestions for full face masks that cover the mouth better than some of the postage stamp sized ones.