Small moves on good edges and one explosive pop to the lip. The hard part is not dabbing the rock behind during the mantle. Short legs are an advantage here
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.