Radical suggestion here buddy.
I know how much you love your beard, but chop the damn thing off and tape properly.
When I first started CPAP and then adjusted to it, I used a nasal mask and never had any mouth-breathing or leak problems.
Then about a year and a half ago, my leaks started creeping up, got bad and I learned I had started mouth breathing. No idea why, and no idea how to stop mouth breathing.
So I ordered some Cover-roll Stretch, but with a beard, there simply wasn't enough surface area for the tape to stick.
So off came the beard. Luckily for me, I am extremely handsome both with a beard and without.
But,... every morning my leaks were back, and the Cover-roll Stretch was barely hanging on. I soon learned that using the xylimelts/drool was leaking and reducing the efficiency of the tape.
I stop using the xyliments and the Cover-roll sticks well every night.
This past Movember was the first one I stayed relatively clean shaven.
I'm lazy about shaving, rarely wet-shave, and use an electric every few days, but now if I let the stubble accumulate for a few days, I'll get some leaks.