After the really nice sitstart go with the right hand to a small pocket. You can use your middle and ringfinger in this pocket so you can use your index finger for the undercling. Then you can use a small hold with your left index finger to bump to a more sloper hold. Put your right feet in the right starthold. And look for the big edge at 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.