In reply to mike_clayton:
Yes it's a pity Petit Bois is getting so mossy and lichened, it's partly because it's a very shaded area and partly because most people don't bother going round the hill or to the top of it. Terrible place to be when the humidity rate goes up: lots of tiny slugs and spiders in the cracks and pockets!!
I do find sometimes that harder graded problems can be easier problems than lower graded ones. It's weird. I guess it's because some problems are very style-dependent, for instance it's very easy to get stuck on a mantle or a slab when you prefer overhangs or walls. Maybe it's also because many easy problems were put up by strong climbers, who may no longer be able to tell the difference between a 3 and a 4. In Petit Bois for example most of the stuff up to 6s was put up by Bernard Théret, who in total opened more than 200 lines up to 8A, so maybe creating the orange and blue circuits was tricky for him (and fair enough, I'm not criticizing him in any way).