Who can't love a 7a sit start to a blue problem? It packs a punch, but then that's understandable because it only has a few feet in which to pack it. As it turns out, the blue problem in question isn't much of a slouch itself, so it's hard to know when the 7a'ing is over and you're allowed to relax.
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.