This is a truly engaging traverse on slopers. Sit start (or as near as possible if you're short), on good holds and traverse the crux to the corner. The move around the corner is awkward, but a rest is possible from the heel hook, and then it's easier ground to the top.
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.