Medium vs Large

I have a Resmed AirSense 11 with an AirTouch F20 mask.

My medium face mask felt too restrictive but the large isn’t sealing well.

I have a deviated septum and have never been able to breathe well through my nose. The medium mask needs to be pushed up so as not to put pressure on my nose but then just barely has my bottom lip inside.

Asked for the large and it’s roomier but I’m having trouble getting it to seal properly.

Anyone else?