Yeah that sounds about right. Except a full face mask doesn't work for me either because I hate breathing through my mouth at all. My mouth stays closed at night as much as possible. If air does come out it comes out through my teeth into my cheeks and out the corners of my mouth. So a full face mask cuts that route off.
UPDATE
I talked to the Inspire certified ENT. She realized the Inspire wouldn't work for me and she did suggest UPPP. But she did not sell it hard. She knows it is not always a good solution. She requested approval from insurance, but she knew they would probably deny it at least the first time (they did), and she said she would appeal. In the meantime I asked for a sleep endoscopy which we did today.
Result,she talked to me afterward with her preliminary observations. She said I am right, my palate is REALLY loose and floppy and stretched out. She even saw it was quite wrinkled up on the back side which she said she has never seen (or hardly ever seen, I was still a little sleepy so not sure which she said).
She's quite sure UPPP would help a lot with that but it would not be a panacea. I also have some significant collapse from the sides of my throat. She said they did a maneuver with my jaw (pulling it forward) that really opened things up so I have to try a jaw advancement device I think first to see if I can tolerate that. I seriously doubt that will work for me from a comfort standpoint but... ya know you have to jump through the hoops. And I'm willing to try. I did try an over the counter JAD but it didn't stay in very well. I'm sure a good one would overcome that. However just having my jaw thrust forward did get uncomfortable very quickly. So we'll see.
I also am going to ask her to look into the AlaxoStent as well. I have a follow up with her on Friday. I still want the turbinate reduction since i quite frequently am dealing with nose stuffiness even aside from any real allergy flare ups.
I personally don't think CPAP does much for this problem at least in the way I have it. Maybe for some whose palate is not quite as stretched out as mine, I don't know. I have a friend on CPAP and she says she never has this problem even sleeping on her back. It does relieve my snoring and inhalation problems but substitutes a different problem that seems for me to be far more sleep disturbing. I spend what seems like hours trying to fall asleep in a position i can be comfortable in, only to be jolted awake by that sensation of my palate slamming shut and me having to consciously open it. It never shows up in the numbers. (It does show up in the waveforms which they don't seem to care about, and I can't for the life of me understand that. Don't they know we have to inhale AND exhale!?
If waveform is not important why do they chart it?

I get frustrated when doctors tell me I don't have much of a problem with apnea. I was sitting here at the table yesterday falling asleep with my eyes open about 3 in the afternoon. I usually start fighting the sensation of foggy headedness by midmorning.
I found a thread entitled "Flow Rate Waveform Examples using a Nasal Mask" that shows a similar (but more rounded) flattening when people switch from nose on inhalation to mouth on exhalation. But with this problem the flatlining is very sudden.
It's very easy for me to snore on exhale even when awake in certain positions, if I relax my throat.