I have the same problem. I adjust the straps and wash the mask and face before putting it on, to remove oils.

Yes. As I posted earlier if you cut a piece of cloth large enough to double over and still be bigger than your mask, and cut hole-slit-oval-whatever where your nose and mouth will be and place it between the mask and your face-it will go a long way to correcting little noise makers.

I don't wear a full mask mine just fits over the nose but at times it gets pushed to one side or the other and it leaks, Just mess with it till it fits tight. It doesn't do you any good if it leaks.

My therapists tell me to get the soft part of the full mask replaced every month. They stretch out. Insurance pays. If it still doesn't seem right I believe its an adjustment that you can do yourself. Play around with it until you get it figured out. Enjoy :)

I can only use mine without a noise if I sleep flat on my back with the head of the bed raised.