Psalm18

Hi. I'm new to CPap, started August 9th, about 2 months ago. I was using the nasal mask but kept waking up with my mouth open. I switched to a full face mask and found it leaking on many a night. I did some reading and found people suggested a mask liner. Stumbled upon the Snugz mask liner and bought it. Seemed to work, no more waking up with wind blowing down my neck. I'm getting a red frown face now on my Cpap machine but the product seems to work. Any idea how to use this Snugz liner better? I'm still finding micro leak under my mouth some nights. I have the mask straps pulled as tight as possible to prevent movement. Thank you!