I know I'm really late with this but for the first move it helped me a lot to sit really low under that starting flake (more a lying start than a sit start really 😅), I'm putting my left foot on the good foothold under the right hand and flag the right outwards. When my left hand is in the crack I sort my left foot to the left and put in the right heelhook for the rest of the roof 😊 Not sure if you're still on it Elin, but maybe this helps other people too
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.