Good point, Wulfman. I agree 100%.if they prescribed your pressure at the "worst case scenario", wouldn't you end up with a lot more pressure than you'd need for 99.9999% of the rest of your life?
That was one of my primary reasons for wanting an auto machine. To my mind, it is a way to run my own little titration study any time I want--in my bedroom after a normal day of doing what I normally do. It isn't nearly as good as a real titration, of course, in some ways. But I think the auto's pressures get pretty close.
I was prescribed 16/12. My auto's 95 centile mark is around 12/8 or 13/9 when I sleep on my side in my bed. To my way of thinknig, that demonstrates the important validity of the points you make.
Certainly the doc-recommendation/diag-study/titration/doc-interpretation (ie, guess!) is an imperfect system everywhere, not just at GatorMan's clinic. Getting another study sleeping on his side might be great. But his needs will still change night-to-night and hour-to-hour as far as how much pressure he actually needs. And that's true however he sleeps and wherever he goes for his study.
The pressures tried by our techs and prescribed by our doctors are an educated guess, at best. (And I think some docs add a few cm to the techie's results "just to be sure.") So I choose to add my own not-so-educated guess to how the machine I sleep with every night performs.
Wait, I think I've just repeated a bunch of things I've learned from reading your posts, Wulfman!
One other point that may be relevant to GatorMan's question:
I asked my sleep doc, whom I respect deeply, if I should sleep the way I normally do at home when I got titrated. His answer was that his preference was that I sleep as closely as possible to the way I slept during the diagnostic study "so that he could compare apples to apples" when comparing the titration night to the diagnosis night. Maybe I don't agree completely with that approach, but I respect it. So I went along with it.
Hope that is helpful.
jnk