The start is impossible to sit start for anyone I think so just hang is out instead! Fun toe-hook action to get to the top holds and then a true Font mantle to fight your way up.
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.