Perhaps if you raise you minimum pressure to 14 cmH2O it may limit the onset of Flow limits, thus limit the pressure excursions, your CA's we will have to keep an eye on.
After 9 months I am just recently overcoming Treatment-emergent central sleep apnea (TECSA),
If you are in a rent to own program, can you change machines?
Will your insurance cover the cost?
To keep your pressures down, you may need "Pressure Support" instead of "EPR".
That entails a different machine.
But for now. sometimes we have to sleep with the machine have.
Keep us posted, with your Oscar results.