Just a quick correction. You are using a PRS1 Remstar Auto model 560, not 160. You are doing very good on the therapy, with nearly no leaks and very few indicators of obstruction like flow limitation or snores. You seem to have the pressures dialed in and get good stable therapy without a lot of pressure fluctuation. Hypopnea seems to be the dominant event, but RERA can be very tiring.
RERA can be a symptom of upper airway resistance, and bilevel is generally easier to work with to deal with it. That was t he reason I got a bilevel originally, even though most don't consider this a therapy problem. With the auto cpap, you can try small pressure increases and see if it improves the volume reductions of hypopnea and reduces RERA. Trying increases in minimum pressure of 0.5 cm at a time and observing the results is really the best approach, and leaves you the option to return to current prescription if it becomes uncomfortable. You have not crossed the pressure thershold to where you're seeing CA, so this option is pretty open to you and is the only tool I see you have readily availalble.