I have been on CPAP since March 2008 and had a good AHI when I started therapy (under 5).
Then my AHI started getting worse- for a while it stayed in the 20's, then we got it to the high teens. Nothing we did would help. My doctor said it was due to the meds I take. For a couple of years I just tolerated the high AHI. I did another sleep study and changed to an ASV machine. For two years I still had a AHI around 11-13. Then all of a sudden - a month ago I noticed my AHI was running five or less. Needless to say I'm pleased after all this time of struggling to finally reach my goal. I've tuned in the machine values so the changes in pressure are very tight.
I still think the Wisp is the best mask for me.
I hope everyone else is doing well. Sure wish we could get the forum active again.