If you can keep your left foot in nice and close, and rock your weight right over it, this mantle is probably easier for us shorties, just make sure you have a plan for what to do with your feet once you're over the lip :-)
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.