In reply to Steve Halfpenny:
I didn't miss your point.
Fontainebleau has very little to offer in the way of steeper ground. You will find no edges like that of churnet or the Tor. It doesn't take much for the boulders to become damp and due to round nature of the blocs run of is common,
The rock dries relatively quickly if there is a nice breeze. Wait it out/save skin and you will be rewarded with a better day.