I would like you to change the machine to auto mode because it will record flow-limitation and Respiratory Event Related Arousal (RERA) events in auto-mode that it will not record in CPAP mode. I think that information could be useful. You can set the minimum and maximum pressure at 17, and your machine will continue to function as a CPAP, or you can try some variable pressure like 14 min-18 max. Mostly, I'd like to see what kind of flow limitation and RERA the machine records. I suspect this will show your RDI is a much greater problem than your AHI alone suggests.
I don't know how to change from CPAP to AUTO. Will snoop around for instructions to do so on my machine. I don't know what impact this might have on insurance coverage, though.
Bilevel would help you to ventilate better. In bilevel the EPAP would be adjusted to where it stops most OA events, then IPAP will help with hypopnea, flow limits and RERA. In your case, simple bilevel may not be enough. You have enough flow limitation, combined with periodic breathing that a ASV or Spontaneous-Timed (ST) Bilevel may be needed. You're not recording CA events, and I find that interesting since your respiration is so suppressed at times, it seems equal to CA. There is air movement, just not enough to ventilate. It would be interesting to have the opinion of a professional pulmonologist regarding what he sees in this flow wave form. It's not normal, and your breathing is not efficient nor restful.
I would be hesitant to the use of an ASV device due to a low ejection fraction. I have heard that ASV could be a factor in death.
I truly thank you, Sleeprider, for your time and the depth of information you have provided me. Depending on the results of the upcoming visit with my sleep doctor, I may ask my general practitioner for a pulmonologist referral and proceed from there.
The Apnea Board forum is a rich source of information supplied by experts who know what they are talking about. I'm very impressed.