Newly diagnosed, and after 19 miserable days with my new machine (worse sleep and less than without it), I found info you all left here that made vast improvement -- just in time for my birthday, yesterday!
Turns out my doc had prescribed EPR but hadn't allowed me access and it was turned off in clinical settings. Once i got in and set it to 3 it made a huge difference. I even got a hint of why I'm using this thing with better sleep quality once I got there. Was so excited by just being about to breathe comfortably awake, that the excitement and sense of hope kept me awake for a while:)
Still have adjustments to make, as even with EPR, by level 8.5 I get uncomfortable aerophagia, bubbles in throat, chipmunk cheeks, etc (even with mouth taped) but this whole thing is starting to feel possible, and that glimpse of good-sleep makes me cry just thinking about it.
Anyway, thanks again!