Very technical arête, not hight dependent! Careful, the block really high, double pads and good spotting. The top part is really easy though! Beautiful line!
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.