my cat Dorian is pretty much the same way. he scratches the couch no matter how many posts we have for him. the couch is shredded in some spots
anyway- do you trim his claws? this helped a lot with my cat, and also we got him a big post shaped like tree from PetCo that he will use now. but thats the only post he will scratch. i'd suggest trimming Fable's claws if you do not do this already. otherwise i'm not sure what can be done to stop this behavior.