[Equipment] Higher AHI Readings on AirSense 11 than AirSense 10

[Bmck8381]

I have been using an AirSense 10 CPAP, Pressure 9 for the past seven years with excellent results. AHI events have consistently averaged below 2, and leakage usually at or near zero. This system was recently replaced with a new AirSense 11 with the same settings. My AHI event readings on the AirSense 11 have consistently been much higher, averaging around 8 and range from 6-12. I am using the same mask, Philips Nuance Pro on both systems. If I switch back to the old AirSense 10, my numbers drop back to AHI less than 2, and no leakage.
My DME swapped out the first new Airsense 11 for a new one. The AHI events averaged 8 on both AirSense11 machines, but the leakage decreased from an average of 15 to 10. They said that some AirSense 11 units have had a leak issue. The leak is minimal, but I am very concerned about consistently getting higher AHI events on the new AirSense 11 than I was getting on the AirSense 10.
Working with my DME and my doctor, we have tried adjusting the pressure setting, as well as humidity and hose temperature, but these changes have not helped. My doctor said that he had another patient with the same issue, and ended up replacing the AirSense 11 with a new AirSense 10 to solve it.
Has anyone else experienced this and found a cause or solution to the higher AHI events on one system vs. the other?