What is your machine, which type of delivery (APAP, BiPAP, straight pressure...), and what are the full settings, including pressure relief/comfort settings?

I recommend you go to apneaboard.com and register, and then put your case to the good people there. They have several very highly experienced and helpful people on staff who have helped literally thousands of people whose physicians/therapists haven't managed to dial in their therapy settings. Note that an AHI of >5.0 is deemed to be 'untreated'. You typical AHI is twice that. If it helps, and I'm admittedly somewhat unusual, my year-over-year average AHI for eight years now is 0.5. Most users on apneaboard will admit to an AHI, and doing well enough, ranging between 1.0-5.0. Again, you're twice, or more, than that range of figures. You are not being treated.

Please, against maybe your reservations, go and register, and download the freeware OSCAR found at the top marquee of the main forum page. Then, place your OSCAR data on a post and ask for help. You may not get it immediately, but you'll get some useful tips on what to change and to try for two/three nights to see if you can get your AHI down to half your current figure.