Thanks all for the encouragement!!!
I've tried the soft collar and also the chin strap.
With the F20 size small - I would wake up during the night with my lower lip hanging out the bottom of the mask;
When I felt bad leaks, it would be on my cheeks - they would feel cold and chapped from the air blowing over them.
But with the new machine I'm not feeling that so much. I have a fat face but a small mouth.
I am going to try each of the masks I have with the new machine.
I also have another new mask on order - full face with the forehead support - my hubby thought it looked like it was worth a try
My original pressure on bipap was 19-23, so I had real trouble with leaks and my face feeling like "wind-burn";
With the lower pressure, I'm much more comfortable; Leaks don't wake me up during the night anymore;
I will think I did really good leakwise until I load my data into sleepyhead and see the results!!
with my old machine, I would do the "mask fit" feature laying down right when I was ready to go to bed and get it to 0 leak - I haven't found a feature like that yet on the new machine.
That red frowny face always gets me in the morning :0