Ok I am back now.
I had the doctors appointment and they agreed that I didn't slept much in back position during the hospital nights. But before they can change anything they said I have to follow the Health Insurance Rules/Procedures and this took so long until now.
While I was waiting (having always 13/EPR-2 not using the backsleep avoiding t-shirt ) for an appointment with the hospital I tried to improve my "other" Health Parameter.
I put myself on a Plant-based Diet, Fixed my Vitamin D deficiency, my cholesterol levels are awesome now, started muscle training, added more cardio and so I lost around 7kg Fat (its also noticeable that my double chin got smaller). Also my blood pressure lowered significantly I was able to reduce my BloodPressure Medicine from 5mg Ramipril+12.5mg HCT to 2.5mg Ramipril only.
Also I got some hose support and special pillow to not disturb the mask placement when I am changing sleep position.
Interestingly my AHI Levels dropped day after day. I am attaching a typical result that I usually get.
What do you think, should I still try to pursue for an APAP machine or should I just go on ? Just asking because today I have the doctors appointment and I am not quite sure what I should ask for.
Still saying that 13 is ok pressure wise, with more pressure I think the nights are more "bad" (feeling wise).
But I haven't tried e.g. 13.6 for one week. I did 13.6 for one night - felt bad and went back to 13.
Is it generally solved/acceptable for me ? I would say no, I am still not really recovered in the morning, but much better then last year. Are values below "5" ok ? SH says "technically treated". But for me as an engineer with perfection in mind I would like to approach <1 if we speak technically.

But maybe I am shooting for too much there.
Not sure how to continue (except for improving further all health parameters)