What a super classic! Feels very powerful on huge underclings until you unlock the sneaky kneebars in the steep bit. In the upper part it is all about trusting your right foot ;)
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.