OK, still testing things out. Without Sleepyhead I'd be flying blind. Basically I've discovered that as long as I'm not leaking I am getting almost no apneas. Here's a sleepy head screen with all the data turned off except apneas and leaks.
I am getting crazy dry mouth even with humidifier on, so I'm testing ways to stop the mouth breathing so I can do to a nasal pillow mask. Tonight's test is a mouth guard with "plug" in it so you can't breathe though the mouth.
If that fails, I'm on to a chinstrap solution.