I'd use this and see what the averages come out to.
one resscan summary report is worth a thousand words and 16 phone calls.
If the numbers are bad, I'd print/email off a resscan report and send to the DME and get them to send to doctor.
I'd also print off the resscan report showing the average minute vent of 7 from cpap, you can select the time period. and include this with it. It will give a data point.
I'm just a XPAP user like you and like the rest of the forum. I can't think of a reason for the AHI to go stupid, because you switch from S to ST mode. At the end of the day, they may need to titrate you in a lab again, to see what is going on.
For auto-cpap, from machine data or software. You can set the min pressure 1 or 2cm below 95%. Or clinicians commonly use the maximum or 95% pressure for fixed pressure CPAP, this can also be used for min pressure.
https://aasm.org/resources/practiceparam...rating.pdf