Have you looked at this full face mask...it takes the nose bridge issue completely out of the equation.
Respironics Amara View https://www.cpap.com/productpage/respir ... -mask.html
The Lansinoh lanolin trick is mainly more useful for nasal pillow users. I don't know if it would be tacky enough for you to help the seal up around the nose bridge area. There's a fine line between just enough to be a bit tacky and the amount that sort of emulsifies with body heat and might cause more sliding around of the mask. If you want to try it....teeny tiny bit would need to be used.
I once thought that if a little works good then a lot would work great...using nasal pillows...so I put gobs on and woke up with the nasal pillow in my ear.
Talk about sliding around....
FWIW....I have never been able to use a FFM that had anything touching my nasal bridge area for my own personal reasons so that really limited my full face mask choices. I have successfully used the Amara View and keep it in my stash of supplies just in case I have a situation where I can't use my nasal pillows.
So you might take a look at it. It's not perfect for everyone but then no mask ever is.