Well, my night with the EPR setting on the CPAP transpired with a complete lack of success. I woke up several times during the night, with the mask giving me next to nothing in the way of pressure. I was still a little tired when I woke up.
Currently the machine is set for a minimum pressure of 5cm and a maximum pressure of 15. The EPR was set to reduce the pressure by 2, so it seems that 3cm is not enough to keep my airway open. I am hereby admitting that the doctor has more experience with these things than I do, and that EPR was probably left off for a good reason.
Down the road after I’ve really gotten used to the machine, I might experiment again with EPR, but set the minimum pressure to at least 7 so that the true minimum won’t go below what it is now.