I was using tape for a week or so. I worked great. Today, I used the chin guard for a 2 hour nap and it worked well. Have you tried the chin guard.

This has been going on for 9 years now. Been using CPAP for 13 years. I finally had to order a special chin strap from the UK called the Nightsbridge chin strap (The one you can get in the US is complete trash). I love the fact that it makes my hair look great the next day unlike most straps, but it also really hurts my ears, so I have to wear padding over my ears, and I have to pull the straps so tight that I have to pad under my chin also. So much to wear on my face. Last week, I went back to trying the same FF mask (Air touch F20) and it works well but even if I loosen the straps, my eyes swell badly. I mean, I'm unrecognizable for a couple of days. I can say that having a chin strap that works made me realize where my tongue needs to be to stop the mouth filling with air but sometimes it still does. Plus, yes, I definitely have to wear this particular strap to slow it down. I have reached out to my sleep clinic to try and get a fitting for the F30i mask since that one will not affect the eyes and it gets really good reviews. The only thing with that one is it has a lot of different parts that come in different sizes and from what I can tell, no size chart to go by, therefore I want my clinic to help me with this. Of course, I have yet to hear back from them. They make all of this so hard for those of us who just can't get it right. Funny side note, early on, I had none of these problems because I was working and stressed out and used to clinch my teeth. It seems, this holds my tongue in place....lol. I waked off my job 9 years ago and have had problems ever since. Now, my jaw stays relaxed day and night, thus the tongue problem.