I still have major trouble with aerophagia, tho. I'm very uncomfortably bloated and have trouble eating even my usual small amounts of "baby food" (bland, simple -- I lost my sense of smell/taste/appetite years ago). My esophagus spasms if pressure is too high, and even with the machine bottomed out pressure-wise, I still wake up with weird squeaking and "busy" noises/sensations in my throat. But clearly there aren't any more adjustments I can do to the machine.
From everything I read, this is likely all due to my years-long fight with GERD and a (probably considerably) weakened LES/UES. Having a stomach full of air -- that doesn't move -- can't be helping with reflux.
I use the ResMed F30 mask, which is comfortable and doesn't leak. I also tape my mouth. But even when I consciously hold my tongue against the roof of my mouth (or other places that effectively cut off the airflow to stomach), air frequently puffs out my cheeks and I have to try to get rid of it without swallowing it. I have an adjustable bed and sleep with my torso elevated at least 40 degrees. I sleep on my back only (can't sleep on either side for various reasons). I also use a soft cervical collar, mostly because it keeps my head in a comfortable position. I don't eat large meals ever, let alone within 3-4 hours of bedtime, and I don't drink or smoke.
If there's anything I've missed with regard to aerophagia relief, please let me know!!
I think it may just boil down to me finding a new GI doc here.