I also have sleep apnea.
I use CPAP. Mine is the Resmed Airsense10.
But i use the Fisher Paykel Vitera instead of the Resmed AirFit.
Initially i used the AirFit but still no good. The tech tell me switch size but still no good. Then i saw another tech and they suggested different brand mask.
Apparently the design of mask fits different face shapes better. With the F+P Vitera I am sleeping better now.
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View attachment 114225
The mask on left is the Resmed Airfit. The one on right is the F+P Vitera that i use now.
Sometines have to try different brand mask. It is not just the size of the mask.