With your max pressure at 13, the mask should hold. Mine is 20 and the Remzz liners work fine most nights.
You can't do it with fleece. It is too thick. You need a thin, thin, super thin old tee shirt or other cotton material. Like an old comfy hanky maybe.
But, seriously, try another mask. I know you probably have but if you are having to crank the Simplus down that tight? It isn't the mask for you. While the Simplus is not one of those "needs to float on your face" FFMs, it does like to be lightly held on. It also is best sitting low on the face, with the bottom of it well below the bottom lip. At least that is how it fits best on me. I can go weeks and have little to no leaks then suddenly have a week where I cannot stop the leaking. Then, suddenly, it is fine again. I have no idea what I do differently.
Wash the pillow well and let air dry. Wash your face well just prior to bed. If you try the liners again, make sure you get the right size and the right one for your mask. Meaning get the one for the Simplus in your size. I accidentally got the one for the Simplus medium (I use small) and it didn't work.
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Breathe deeply and count to zen.
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