Bread-Bakers v113.n011.6

I used a cloche years ago, made by potter friends for me.  I found 
that the cover would stick if I put too much dough on the base, i.e. 
when the dough would touch the cover during rising, or if the dough 
was spreading out too much.  Sticking to the base was never a 
problem, I just floured it well. Another thing I used to do was to 
bake my bread from cold in the cloche, which resulted often in 
spectacular oven spring, where the bread lifted the cover up (but 
didn't stick to the cover).

Keep experimenting, it's worthwhile!

Good luck and happy baking,
Andreas