Last night I used my chin strap, and I did pretty well.
What I've noticed is as time progresses and the pressure level automatically increases, I'll get the chipmunk cheeks and then the air puffs out between my lips and yes, it wakes me up. Sometimes continuously. I am able to fall back to sleep very easily but it's not an ideal situation, lol. It's worse if I'm on my back, the problem with being on my back seems to be I need higher pressure to combat the apnea but then that higher pressure affects my cheeks and, again, I wake up continuously (I'm a side or stomach sleeper, but I'll sleep on my side only when wearing the mask).
My settings were all preset by the equipment provider. I'm unable to adjust the pressure setting, if that's even possible.
(ResMed AirSense 10 AutoSet with a DreamWear Gel Nasal Pillow Mask)
Something else, my left nostril feels as if it's larger these days. And it's mildly painful when I wake up, it does go away after several hours.
Please let me know if I shouldn't reply to this post, I went for it as it seemed within the context. Thank you

Here's to REM sleep.
ResMed AirSense 10 AutoSet with a DreamWear Gel Nasal Pillow Mask