I've been using the Dreamwear FFM for about 3 years now, and what helped me was this pillow:
https://www.amazon.com/gp/product/B01MRLWJMF
But it shows currently out of stock, so I don't know if it's been discontinued or not. Looks like this might be the current version:
https://www.amazon.com/Contour-Products-Sleeping-sleepers-alleviates/dp/B01LYNBWXG
Here are the current Contour Products CPAP pillows -
https://www.contourproducts.com/cpapmax
I was never able to use a regular pillow comfortably, but this seems to do the trick.
Good luck!