WELCOME! to the forum.!
Hang in there for more answers to your question and best of luck to you.
Welcome KC2684, Zonk is right, it sound like your previous machine was an Auto and now you have a fixed CPAP. With the auto the pressure raises to the maximum pressure set as needed then slowly lowers to the minimum or where required. You need to look at your data, your pressure may need to be raised a bit to accommodate for it not increasing enough. If you download Sleepyhead or ResScan for here for free and see what you 95% percentile figure is and your median figure and let us know. You really need a week or two of data to get an accurate picture
KC2684, the old CPAP is the same then, EPR is used for comfort for when you exhale, I also have mine set at 3, that is really a personal thing but you could try lowering it or even turning it off to '0' to see if it helps. I think you need 5 posts on here before you can attach a file. The Autoset is the better machine as it gives you the comfort of being able to increase or decrease your pressure during the night as needed, not sure how you got yours and whether you can change it.
But Wait there's more...
I gave my old S8 a run.
When I breath out the EPR comes into play and the pressure drops. What I noticed as an increase in pressure was the EPR reverting to the set pressure either:
1 When I breath in
2 When a time passes. The time seems to be a function of my normal berthing period.
I am not sure that the S9 actually is reducing pressure at all (I'll try it some more), but even if it is, its not reverting to the set pressure.
Again I'll talk to the manufacturer and the Dr.
(trying to make attachment smaller)