My husband has been using a CPAP machine for a few years because he has severe OSA, his base line sleep study AHI is over 70. He said this machine is life changing and I saved his life since I am working with two sleep specialists part time. Of course we both sleep better now, he dose not snore anymore more, it is win win situation!
From my experiences, Usually first option treatment for OSA are CPAP or Auto Set CPAP machines and many people adapt it well. Central apnea means the brain dose not send signal to breath, so need to use BIPAP or Auto BIPAP for treatment which is second option. Then the complex sleep apnea will need ASV machine which is the most advanced model for PAP device.
If you have central sleep apnea, it is better to use BIPAP model for treatment. Since you have Auto BIPAP, it adjusts pressure itself for you, it has inhale and exhale two different pressures. I saw you have been trying many different settings already. Now If you can try for higher inhale pressure usually 20 and lower exhale pressure 6 or 8, and your treatment pressure will be at the range 6-8/20 all night. You can try for few nights and see how you feel. Auto set BIPAP should be much better than CPAP machine. I think your exhale pressure was little too high 10 or 12...maybe that's why you felt uncomfortable
Hopefully you will feel better about your machine soon.