I switched to a bi-pap 6 months ago. Terrible leakage and AHI. Tried every mask--have Euvora now. I am a mouth breather and also clinched my jaw. I had one molar pulled as a result and got a night mouth guard. Having tried all the suggestions for mouth breathers, none worked. Was so tired I had a mini-meltdown in my doctor's office. The only thing I had left to do was tighten my mask. I know one is not supposed to have it too tight but tightening the mask worked for me. I do have to replace the Euvora a bit more often than others. My AHI and leakage have dropped. I sleep, not weep now.

In sum: They told me it would take some time--it sure did! @theamericanbrit provided some good advice on things you can try. Also, a bit of encouragement. Don't give up. You will find your way.