I had many desperate attempts on the mantle, before figuring out I could place my left toe on the edge. I uploaded a video of it, maybe someone will find it useful :)
Rain sucks, but broken holds suck even more. Remember, never climb on wet rock in Fontainebleau.
The sandstone becomes brittle, and pulling on it will ruin classic problems. Drying it doesn't help, because it's still wet and weak inside.
All you can do is wait for better conditions.